Return Of The Jedi
Let’s face it – the original Star Wars trilogy suffers from a severe extras problem, which George Lucas apparently tried to rectify later by making the entire cast CGI.
Nevertheless, in the originals, we still had actual people wearing costumes, which led to some hilarious situations. The Mon Calamari, which Admiral Ackbar belongs to, are a race of seafood-looking dudes.
In one Return of the Jedi scene, a Mon Calamari extra who obviously can’t see through his costume misses the button he’s supposed to press by a good six inches, realizes it with a start, and then walks over to where it is.