For the movies themselves I hate it when there is a character there purely for comedy relief. AKA Jarjar, Jack black in orange county.
Also I hate it when when fat people are used to get points across like Adam Sandlers past girlfriends in the movie Click. It's just so stereotypical and unimaginative.
" "this tone ain't workin for me" is the first thing a guitar player says when he hasn't done his homework"- Bob Rock