Soul Surfer
2011's biopic Soul Surfer follows AnnaSophia Robb as Bethany Hamilton, a surfer who survived a horrific shark attack. Green tape was wrapped around Robb's arm so they could digitally remove it from the film. However, in this scene, they forgot to edit it out.
Mean Girls
When Cady (Lindsay Lohan) accidentally scares Janis and Damian in 2004's Mean Girls, Damian flings his bowl of popcorn everywhere. In the following shot, the bowl is refilled. Why can't that happen in real life, too?