During the party when they are playing musical chairs, the Hooded Avenger puts on a party hat then it suddenly disappears.
Show Announcer: Will Al figure out how to communicate with Huey? Will Huey figure out that being a bully isn't cool? WILL I EVER STOP THIS ANNOYING SHOUTING?!
Huey Toppersmith: No one likes me!
Al: I like you! I mean, in theory. If you weren't so bossy. In an alternate universe where you weren't like a tyrant, I like you.
According to the DVD commentary, the original title for this episode was "The Cave Is Alive with the Sound of Music."
This is Stan Freberg's favorite episode.
The song from Weird Al's "Jerasic Park" music video is a parody of the Donna Summer song, "MacArthur Park."