Continuity mistake: During Yakko's song, an eraser keeps appearing and disappearing from the chalk tray beneath the Multiplication problem.
Star Truck - S3-E31
Continuity mistake: After the Enterprise smashes Korn's ship with a mallet, we see Yakko at rest in Captain Kork's chair. A moment before he stands up, Yakko's left elbow places itself on the armrest between frames. And, between the following pair of shots, Dot jumps several feet behind Wakko when Yakko says, "Promise not to sue us."
Continuity mistake: When Ms. Flundergust is introduced to the Warners, she mispronounces Dot's name. Dot has both hands behind her back, but they jump in front of her between shots. Then within the next change of shots, both of Yakko's hands jump behind his back.
Star Truck - S3-E31
Continuity mistake: During the sick bay scene, right as the Enterprise starts getting blasted by Korn's ship, Dr. McBones' tunic changes color from blue to gold.
Continuity mistake: When the Warners and network censors are in the lab for a demonstration of cartoon violence and its effects on a younger viewing audience, the painted 'L' on one of the lab's doors turns backwards, but several shots later it returns to normal.
Hello Nurse - S3-E58
Continuity mistake: In the scene where Miss Nurse struts downtown past onlookers on either side of the road, Yakko and Wakko switch places between shots.
Continuity mistake: When Yakko is multiplying 47 by 83, he walks away from the chalkboard and continues to sing. But one shot before he finishes solving the problem, the answer appears on the board.
Factual error: Ben Franklin's "electricity kite" experiment and the Declaration of Independence happened 24 years apart, not at the same time.
Continuity mistake: During the picnic scene, Ms. Flundergust grabs a sandwich from her basket but the lid closes on its own between shots.
