This episode (along with "Arnold's Room" and "Arnold Betrays Iggy") was originally aired before the episode "Rich Kid", so Lorenzo (who is standing between Helga and Iggy in the choir) wasn't identified the first time the episode was shown.
Lorenzo's vest was red (instead of blue) when Mr. Simmons told Gerald he has lots of enthusiasm.
Gerald's doctor's name is spelled "Murray Stieglitz" on the sign, but "Steiglitz" in the credits.
Gerald's doctor seemingly violates patient privilege in telling Gerald about Harvey, unless Gerald's doctor talked to Harvey first off-screen.
When Mr. Simmons was talking about giving the part away to someone, the word "AUDITORIUM" above the doorway was white, and once Stinky came out, the word was blue.
Gerald's mouth isn't moving when the kids first started laughing at him on the playground.
Rhonda's shoe switched from a low heel shoe to a wedge heel, and then back to low heels.
Lorenzo was wearing a blue suit (instead of black) as Harvey was coming in to sing the solo.
At the ending when all the kids were with Harvey, Lila and Iggy switched each other's skin color.
