The amnesia glitch is just so darn useful for writers.
Another one is the identity-swapping & mistakes. Everybody has done it for centuries. (Ancient Greeks, Shakespeare, etc.) But in real life it's rarely that workable. It's hard to interact with anybody who knows you and not be discovered, no matter what you've done with costuming & makeup. And it's almost impossible to pass yourself off as another specific person who isn't in your immediate family.
Some world leaders are known to have doubles (Putin, Saddam, etc). But it's not the 'Mission Impossible' thing that it sounds like. The doubles are used for brief public appearances (like standing on a balcony, waving to a crowd). They are usually covered up in a coat & hat & sunglasses. The real leaders use them to avoid assassination risks. Or to convince the public they are healthy when they really aren't.