When you watch a movie in theaters or at home, it's easy to ignore the fact that making it was a painstaking process with a lot of moving parts. Truthfully, that's the way it should be, because if you can see the seams to a production, it's probably not a quality one.
Having said that, even the best the film industry has to offer lets little mistakes through to the final cut. When there are tons of different scenes, lines, costumes, set pieces, and a lengthy post-production process, every now and then a gaffe slips through the cracks. It happens in romantic comedies, dramas, thrillers, horror flicks, and every other genre.
Since it's not a mistake limited to any one silo, it's best to just make light of the situation and admit that people make mistakes. To that end, Looper has compiled a video of 20 such slip-ups in the final cuts of films from blockbuster franchises such as Star Wars, Harry Potter, and Captain America. None are really that outrageous, but they're fun to spot all the same.