Danny Tamberelli (Arnold) provided the voice of Ralphie for two lines in the episode Makes A Stink. Also, in the episode Getting Energized, Phoebe's voice can be heard on Dorothy Ann when falling into the river.
Cheer up, Arnold. A famous poet once said, "All the world's a field trip, and all the kids in our class are merely guinea pigs"... or did Ms. Frizzle say that?
At the end of the credits of every episode, following the Nelvana and SCETV logos, the show's logo appears as Liz pops out from behind it and waves to the audience.
VHS and DVD versions of the show are uncut and feature the producer segments at the end.