I didn't think much about Shinichi and Ran's phone call, since I've been in similar situations. When someone randomly calls me while I'm busy doing something else, I tend to be fairly lacklustre about whatever exciting news they have and am more focused on getting this person off the phone so I can back to what I was doing.
Okay, so maybe I'm a jerk too.

(Though I've also been on the other side of that, where I'm the one with exciting news and whomever I'm calling is distracted and not paying attention.)
So Conan is in full fanboy mode and suddenly Shinichi gets a call from Ran. He was probably more interested in getting her off the phone, especially since the wrong noise (like someone shouting up the stairs in English) might tip her off that he's actually in the same building as her.
Admittedly, it was short-sighted not to ask for souvenirs. That was the most suspicious behaviour so far, I think.
pofa wrote:For some reason, I assumed Agasa faked passports and things for Conan and Haibara a long time ago.
At the very least he must've faked some school records, otherwise how could they transfer into a "new" school? (Not that I know anything about the required paperwork; I'm just guessing.)
Also, there was the case where Shinichi's parents were introduced. If I remember correctly, they wanted to whisk him off to America. Wouldn't he need a passport for that? Well, I suppose they could've pulled some strings or called in some favours to make it happen.... Of course, something from 600+ chapters ago probably has limited relevance.
This chapter did feel a bit rushed, but with everything that had to happen before the end, it's understandable (annoying, but understandable). I thought the random invitation was part of the rushing - a plot contrivance to get our characters where they needed to go. Now I'll probably be proven wrong in the next chapter; it's what I get for taking things at face value. *laughs*
Plot contrivance is also the only reason I could come up with for why neither Ran nor Kogoro checked on Conan's passport themselves.
"I mean, no one just pops in on you when they have to climb five flights." - Corrie Bratter, from "Barefoot in the Park" by Neil Simon