Revealing mistake: When Laura tears the piece of paper with the LAX clue on it, you can see the paper crease so she will have a straight tear.
Revealing mistake: When Bolt Jenkins lands right into the Gekko Flakes commercial, the whole scene shifts for a bit. Obviously, the cells got a bit messed up during layering while making the scene.
Revealing mistake: At the end, in the fight with Bluto, Popeye is facing Bluto on one side, goes underwater, and pops up on the other side. If you watch closely, the figure that goes under is the stunt double. Nobody can move 15 to 20 feet underwater in three seconds. Also, before Popeye comes up, you can see him underwater while the other figure goes under.
Revealing mistake: After the shot that shows Herbie spitting sea water from his exhausts, look at the bumper in the next shot of Herbie, when he gets black smoke from his exhausts. The rust doesn't look real, because they used paint to make it look like rust.