Sometimes a good mistake is exactly what you need to make a movie scene work. These bloopers and errors technically shouldn't have happened - but once you watch the finished scenes, you'll be glad ...

Think you caught every detail? These movie mistakes slipped past even the most eagle-eyed fans.

Sometimes the best movie scenes are complete accidents.

HBO's upcoming Harry Potter remake has the opportunity to do the books justice, as long as they don't make the same mistakes the movies made.