In "Buster's Best Behavior", after Francine tells Arthur and Buster to be themselves and to come play soccer with her, in one shot Buster is in his regular clothes and then in the next shot he is in Arthur's main outfit. Animation problems I suppose.
Bionic Bunny: (seeing a big bobbin with a nose attaching to it) What is that thing?!? (turns and sees the cats) Whatever it is, it's hypnotizing cats all over the city!
(The cats walk as zombies while meowing.)
Boy in the Red Shirt: That's a bobbin, Bionic Bunny. Quick, pull its nose before the cats take over the city!
(Bionic Bunny walks over to the bobbin and pulls its nose but the bobbin string captures him. As a result, the boy peels off his mask and reveals himself to be....)
Bionic Bunny: (gasps) Elias Howe!
Elias Howe: Now I can conquer the world! (laughing evilly)
(The screen freezes and shows a "To Be Continued" card.)
Announcer: Tune in next week for part 2: Bionic Bunny vs. Elias Howe, written by Buster Baxter.
This marks the first appearance of Brain's accident-prone model airplane. It will appear again in a few other episodes (and would typically be seen crashing again.)
Various: Element X
Element X is a parody of Chemical X from the 1998 cartoon series The Powerpuff Girls.