Timing!

You have a countdown to something exploding or being underwater, or the characters trying to avoid a tidal wave, lava, car wreck (take your pick) and they ALWAYS seem to have time to have a romantic moment, or have some serious dialoge, stop and grab a purse/child/laptop, whatever and the time never runs out on them, or they always avoid the catastrophe.

I don't know why, but that drives me nuts!

Another thing. Back when I used to watch soap operas (Santa Barbara) I always found it odd that one day could be stretched to last a week in real time, but strangely enough the holiday's ALWAYS matched up with the real life calendar. Go figure.

My favorite site for movie flaws..... http://www.nitpickers.com/