The Catwoman from Channel Six - S2-E12
Continuity mistake: While April is in Shredder's lair taking photos, when the cat shows up, it has a tail with a white tip and a white underbelly. However, when Irma shows April's photographs to the Turtles, the cat in the photos has a solid tail, though the cat's white underbelly is shown properly.
The Catwoman from Channel Six - S2-E12
Continuity mistake: When Leonardo cuts off April's collar, she asks what happened, but instead of it being Leonardo standing there with the sword, it's Donatello with the sword.
Chosen answer: The Turtles' pizza obsession was not in the original comics, which were far more adult in the violence and language they contained. Peter Laird, one of the comic's creators was critical of this aspect on his blog in 2012, saying if he had control over the 80s cartoon's creative direction, the Turtles "would not have been so ridiculously obsessed with pizza".
Sierra1 ★