Other mistake: At the start of the song, Iceland appears twice on the map, and in two different colors. Also, a large portion of Antarctica is cut off.
Other mistake: In the scene where Yakko, Wakko and Dot are sitting at their desks repeating Miss Flamiel's every word, Wakko is drawn without legs (only feet) during one shot.
Other mistake: When Dot takes a swipe at Dr. Scratchansniff's purple couch, she somehow cuts five slices into it with only four claws.