Married with Fishsticks - S5-E15
Revealing mistake: In the scene where "Crustacea" is being hung upside down in the water by the children, you can see her wig detaching on the sides by her ears.
Xena: Warrior Princess (1995)
1 revealing mistake in season 5
Beware Greeks Bearing Gifts - S1-E12
Revealing mistake: At the end when Xena is fighting Deiphobus, he pushes her up against a large rock, every time she hits the rock it moves, as if it were foam.
Trivia: This was the 2nd of a two part episode, and the script had to be totally re-written as a mostly Xena Free episode due to Lucy breaking her pelvis in an accident on the Jay Leno show.