Continuity: Various times through the movie, Heloise Collins's pink scarf alternates from her shoulder/arm, changing positions occasionally.
Audio/visual unsynchronized: It is clear in some scenes that Bart is not really playing the piano: sometimes he misplaces his fingers, sometimes he does not move his fingers correctly, sometimes he even fails to press down the keys.
Continuity: When Bart hides in the large vase, he places a bunch of flowers on his head. When the guards lift him from the pot, they are on his head. In the cut-out shot moments later, the flowers have disappeared.
Continuity: In the first scene in the Tewilliger institute, Dr. T. buttons his jacket closed after putting his baton away. Immediately after in the long shot, his jacket is open, then in a closer shot, it's buttoned again.
Crew or equipment visible: When Bart climbs the huge ladder to escape the guards, when he jumps off of the ladder, you can clearly see a thick wire holding him.
Audio/visual unsynchronized: Throughout the whole of the instrumental scene, with the various performers, there are so many continuity, revealing and a/v mismatch goofs that it would be impossible to record them all.
Continuity: When Dr. T catches Bart, his mother and Mr. Zabladowski trying to escape (after the fight with the twins), he is wearing a lavender coat with black trim when he first appears and says, "I, on the other hand, am inclined to doubt that." For the rest of the sequence, he wears a black coat with a pink treble clef and white stripes representing the five-line staff.