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 we see Dinah, Lloyd and Harvey walking to school the first time if you watch the top of the screen you can see the boom mic drop down into the shot a few times. (00:04:42)
Trivia: The show is adapted from four of Gillian Cross' "Demon Headmaster" novels. The first half of the first series is adapted from "The Demon Headmaster", the second half is adapted from "The Prime Minister's Brain", the second series is adapted from "The Demon Headmaster Strikes Again" and the third series is adapted from "The Demon Headmaster Takes Over."