Finding Nemo (2003)

Plot hole: When Nemo is coming out of the filter after trying to stop it for the first time, it starts to go again. The fish come to help him, and the fake seaweed they put in there doesn't reach. When they show the fish, they still have almost half of it they could put in to save him.

Plot hole: When Nemo swims off to the boat, a diver pops up and catches him, and all the fish react. But this diver should have been visible to Marlin and co. long before it reaches Nemo, as they are far enough from the boat and looking out into open sea, yet none of them reacts until the diver is right behind him. Also, bubbles should have risen into shot before the diver does. (00:14:25)