Spoiler:
Producer Harawaki's death video just seems to accurate to actually be faked. It would be incredibly difficult to get him to wear the correct clothes and get it all right about how he died and such. Its more likely that he was planning to film himself faking suicide and someone messed with the bottle or the container of the poison so he got poisoned for real. For example, someone could have delivered the water bottle to him with the poison already on it, while the poison container might not have actually had poison in it. Conan mentions that the poison container was labeled "potassium cyanide" but they did not indicate whether they actually checked the container itself for its contents.
Chances are, Producer Harawaki probably knew the way the trick of hiding the younger brother worked. Most likely he created a situation where the person could not get out of the place he was hiding in, and attempted to scratch his way out, causing the fingernail damage. He then probably created the situation where the actress Kawabata became ill. If he refused to go back so that he could take care of her, then this creates a situation where none of the other people can leave as well because they can't drive... (that's still not enough reason that one of them couldn't have called the police though... unless they were also in a location with no cell service like the current location) The body was probably hidden in some kind of crawl space beneath the floor covered over by a piece of furniture, or in a false back for the dresser in the corner that can't be opened from the inside when its up against the wall. Since Harawaki moved the dresser, chances are the placement of the dresser is key to how the body was hidden and locked into place until starved.
I'm still not quite sure why Kyouko was killed. It probably has something to do with her figuring out the trick and having knowledge of the missing footage from the past. As she is a camera person, she probably has knowledge of cameras which we, and the rest of the group, may not have. If she had figured out the trick, and was refusing to talk until the police arrived, then this is more than enough reason to kill her to make sure that she doesn't talk to anyone. I don't think this murder was premeditated. It just seems awkward to me that the story they are trying to get us to believe is that someone who died from drinking poison just turned into a zombie. Something just seems off about it..... which is weird, because if this one hadn't been planned, then why wasn't it easier to catch or possibly interrupted? The people where all conveniently in separate rooms and didn't join together until possibly after the murder?
As for the trick, the blood splatter on Harawaki's face does not line up correctly, and something about the face in general doesn't seem the same as the face in the image before it. In addition to this, Kyouko's mouth is closed in one frame and open in the next. One of the things I noticed about all of the panels that we see of the "zombie" in the video on page 14 of 933 is that no matter what, you can't see the murderer's right hand. The person even walks backward towards the camera rather than turning around and walking towards it. Then suddenly we cut to the top of the next page and get an up close image of the face where we can see the right hand moving the camera phone. If anything, I think that the first half of the video is completely real and was filmed "today" and shows us someone wearing the same clothes as Producer Harawaki and shows them walking up with the cutter-knife in their right hand and stab her in the neck and then walk slowly backward with the knife still in their right hand so that we can't see it. Then there mist be a cut of some kind where there is a way to insert the face of the Producer in zombie makeup the way it is shown. As for the odd shape in the wall, the diagonal-down-right line, I think its possible that the killer may have noticed that the blood had some kind of identifying print in it that proved who they really were and removed it, which is why its not there in the room when the suspects all find the body. (continued below the images).
Also I think that this phone is the killer's phone, and the killer is Baishou Orie, the lights staff person. Chances are, in this instance in order to have the phone already set up when Kyouko ran into the room and to manipulate the situation best, she would have had to use her own phone. I believe that the reason the Producer rotated the phone so that it was facing down toward the floor is that he wanted to try to indicate the light, the flash, on the phone. Kyouko, as a camera person, and one who has knowledge of the footage from the past as well, may have put all the pieces together. This is why she was killed. Orie may not have noticed the flash itself, but did notice that the camera was flipped so that it has black screen. When committing the second murder, she copied this action to try to make it seem like he was doing the same thing again. The body of the Producer though is probably in the same location as where the younger brother's body in the past was hidden until he starved to death.
Chances are, next file we will get something like Baishou Orie getting attacked by the Producer zombie somehow. If she did use her phone during the trick to kill Kyouko, its possible that she may use Kyouko's phone for this. However I kind of question if we will see the Producer again, whether on film or otherwise. Now that his body may be hidden, it would be really difficult to maneuver it well.
Also, just like in the last case.... she has different glasses in the present day than the ones in the flashback. Willing to give benefit of a doubt on that though since there is an 8 year gap and people do get new glasses occasionally.
Chances are, Producer Harawaki probably knew the way the trick of hiding the younger brother worked. Most likely he created a situation where the person could not get out of the place he was hiding in, and attempted to scratch his way out, causing the fingernail damage. He then probably created the situation where the actress Kawabata became ill. If he refused to go back so that he could take care of her, then this creates a situation where none of the other people can leave as well because they can't drive... (that's still not enough reason that one of them couldn't have called the police though... unless they were also in a location with no cell service like the current location) The body was probably hidden in some kind of crawl space beneath the floor covered over by a piece of furniture, or in a false back for the dresser in the corner that can't be opened from the inside when its up against the wall. Since Harawaki moved the dresser, chances are the placement of the dresser is key to how the body was hidden and locked into place until starved.
I'm still not quite sure why Kyouko was killed. It probably has something to do with her figuring out the trick and having knowledge of the missing footage from the past. As she is a camera person, she probably has knowledge of cameras which we, and the rest of the group, may not have. If she had figured out the trick, and was refusing to talk until the police arrived, then this is more than enough reason to kill her to make sure that she doesn't talk to anyone. I don't think this murder was premeditated. It just seems awkward to me that the story they are trying to get us to believe is that someone who died from drinking poison just turned into a zombie. Something just seems off about it..... which is weird, because if this one hadn't been planned, then why wasn't it easier to catch or possibly interrupted? The people where all conveniently in separate rooms and didn't join together until possibly after the murder?
As for the trick, the blood splatter on Harawaki's face does not line up correctly, and something about the face in general doesn't seem the same as the face in the image before it. In addition to this, Kyouko's mouth is closed in one frame and open in the next. One of the things I noticed about all of the panels that we see of the "zombie" in the video on page 14 of 933 is that no matter what, you can't see the murderer's right hand. The person even walks backward towards the camera rather than turning around and walking towards it. Then suddenly we cut to the top of the next page and get an up close image of the face where we can see the right hand moving the camera phone. If anything, I think that the first half of the video is completely real and was filmed "today" and shows us someone wearing the same clothes as Producer Harawaki and shows them walking up with the cutter-knife in their right hand and stab her in the neck and then walk slowly backward with the knife still in their right hand so that we can't see it. Then there mist be a cut of some kind where there is a way to insert the face of the Producer in zombie makeup the way it is shown. As for the odd shape in the wall, the diagonal-down-right line, I think its possible that the killer may have noticed that the blood had some kind of identifying print in it that proved who they really were and removed it, which is why its not there in the room when the suspects all find the body. (continued below the images).
Also I think that this phone is the killer's phone, and the killer is Baishou Orie, the lights staff person. Chances are, in this instance in order to have the phone already set up when Kyouko ran into the room and to manipulate the situation best, she would have had to use her own phone. I believe that the reason the Producer rotated the phone so that it was facing down toward the floor is that he wanted to try to indicate the light, the flash, on the phone. Kyouko, as a camera person, and one who has knowledge of the footage from the past as well, may have put all the pieces together. This is why she was killed. Orie may not have noticed the flash itself, but did notice that the camera was flipped so that it has black screen. When committing the second murder, she copied this action to try to make it seem like he was doing the same thing again. The body of the Producer though is probably in the same location as where the younger brother's body in the past was hidden until he starved to death.
Chances are, next file we will get something like Baishou Orie getting attacked by the Producer zombie somehow. If she did use her phone during the trick to kill Kyouko, its possible that she may use Kyouko's phone for this. However I kind of question if we will see the Producer again, whether on film or otherwise. Now that his body may be hidden, it would be really difficult to maneuver it well.
Also, just like in the last case.... she has different glasses in the present day than the ones in the flashback. Willing to give benefit of a doubt on that though since there is an 8 year gap and people do get new glasses occasionally.