Even Disney does it: Animators economize by reusing old scenes

When times are hard, you recycle. You make use of stuff you already had rather than spending to buy more. Even Walt Disney movies have done it, copying movements, gestures, and moments virtually line-for-line, pretty much tracing over old artwork and using old movies as visual templates for making new ones.

People in the animation community have known that Disney was prone to ripping itself off -- the duplication is managed through a practice called rotoscoping. But it took an eagle-eyed contributor on YouTube, that great connector of dots, to actually link up the copycat moments.