What one or two aspects that appear in quite a few films annoy you? Things like turning on the TV and it just happens to be on the right channel to fit in with the current situation, etc. It's hard to explain, it just came to me yesterday as a thread idea.
For me it'll have to be the 5 minutes of credits you get at the BEGINNING of some films. Annoys the hell out of me. I wanna watch the film darnit! Leave the credits till the end!