I’ve always liked looking for and pointing out mistakes and inconsistencies in movies. A lot of times, it’s obvious that something changed between takes and the production assistant didn’t catch it. A common one is that someone’s glass switches back and forth from being full to half empty depending on the shot. A popular mistake in American Pie is that a cup of beer containing some amount of bodily fluids changes from blue to clear plastic before Stifler drinks it. In other cases, a piece of production equipment is visible in a shot, such as the compressed gas canister which can be seen in the back of a chariot during Gladiator. All of these mistakes big and small are collected for your browsing pleasure at the Best Movie Mistakes website. The most popular mistake of all time is from Star Wars. A storm trooper bangs his head on a doorway as he walks into the room. Take a look at the video if you’ve never seen it, because it is pretty funny.