Continuity mistake: When R2-D2 closes the door to the platform in the back of the monastery (before Asajj attacks Ahsoka), Asajj stabs both of her lightsabers through the door, a few inches apart from each other, and starts moving them downward. In the next shot, on the other side of the door, there is already a solid line (the top of the circle) cut into the door. There wasn't enough time for her to have stopped and connected the space between the two holes.
Continuity mistake: At the end of the movie, it's revealed how Alex can tell Marty apart from all of the other Zebras - when Marty walks away from the "camera" it shows the huge bite mark on his backside that Alex gave him in the first movie. However, the bite mark is never seen in any other shots of Marty's backside throughout the film.BocaDavie
Continuity mistake: As Gromit tries to get to the window with the bomb, he is stopped by being hit hard with a large metal oven paddle which swings in from his front right side. When we see Piella holding it, there is a Gromit-shaped dent in it, but it is dented the wrong way, bulging outward on the side he was hit with instead of indented.Greg B
Continuity mistake: In the scene where the Mayor is talking to Dr. LaRue, there is a rack of test tubes on the counter top. The position of the test tubes changes multiple times during this scene. This can be especially noticed after the Mayor spills the chemical and it eats away a big hole in the counter top, if you compare the position of the test tubes with the hole between different shots.SteveQ
Continuity mistake: In the scene where Lisa feeds Ponyo and Sosuke noodles some of them fall on the table. However the noodles disappear and reappear between shots.