The ones I hate are ones where a really good movie is wrecked by a moment of total implausibility. Like "Raiders of the Lost Ark" where Indiana Jones takes a ride on a submarine conning tower -- hey, what if they decide to submerge? No, they are going to cruise along so you can make it to your destination dry. Come on.

The one that has me really worried, though I haven't seen the film since, is someone pointed out that the "letters of transit" in Casablanca don't make any sense at the end because who are they supposed to give them to? No one in Lisbon cares. There are no customs/guards at Casablanca airport. Why doesn't everyone just get on the plane and go? I haven't yet worked out if this wrecks the whole movie for me.

yours, Peter T.