Revealing mistake: Throughout Series 2 Eve's reptilian hand is a glove made out of rubber and you can tell whenever she bends her wrist and the "skin" twists and wrinkles. An obvious example of this is in Episode 6 when she has finished going through "Accelerated Learning" and removes the listening device, bending her wrist and the glove in the process.
The Demon Headmaster (1996)
1 revealing mistake in season 2 - chronological order
Starring: Terrence Hardiman, Frances Amey, Gunnar Cauthery, Thomas Szekeres
Episode #1.1 - S1-E1
Visible crew/equipment: When Lloyd and Harvey are studying in the library (just before Harvey says "what do you think they're doing?") the boom microphone drops down into the frame above Lloyd's head. (00:14:17)
Trivia: The music used for the Octopus Dare computer game is an 8-bit rendition of the show's main theme tune.