Just saw this funny video pointing out a movie troupe: that characters often just hang up the phone without the courtesy of verbally signing off.
I've got another one, and it's bugged me for years. Think of virtually any movie with classroom scene. The teacher or professor will be giving a lecture, always in the middle of a subject(say, Matthew Broderick's character in "Election" discussing ethics vs. morals). The bell will then ring, sending the students on their way. Not only has the lecturer poorly timed his lesson, but, amazingly, none of the students seemed antsy about it. In real life, students start packing up their stuff within five minutes of the end, and by the thirty second mark most educators have given up speaking. File it under "heightened reality," I suppose.