Revealing mistake: When Allison is "seeing" the Massey house going up in flames, James flinches when the painting falls off the wall behind him, even though it is only supposed to be happening in Allison's vision.
Medium (2005)
1 revealing mistake in The Reckoning - chronological order
Starring: Patricia Arquette, Sofia Vassilieva, Miguel Sandoval, Maria Lark
Plot hole: In this episode, the Duboises make such a big deal about Ariel being old enough to finally learn to drive. However, two episodes previously ("Things to Do in Phoenix When You're Dead") Ariel drove to school with Joe, and Joe complimented her on her prowess.
Allison Dubois: I just had a weird dream.
Joe Dubois: Of course you did. It's a day ending in "Y."
Trivia: In the episode "Mothers Little Helper" When you see the front of the refrigerator, the word HARLO is visible on it, Patricia Arquette's daughter is named HARLOW, fitting for a storyline about mothers and daughters.