The Monsters Are on Maple Street - S1-E32
Continuity mistake: During the disturbance, the crystal punch bowl shatters, spilling glass and punch all over the table. Subsequent shots show the punch bowl still intact with no punch spillage.
Continuity mistake: When Claudette, Danni, Julien and Wagenbach are at the overturned churro cart crime scene, Claudette is seen pulling a pair of white gloves from her pocket. The gloves then disappear from her hands in a wide shot of her talking to Julien about the crime scene, but reappear in the next shot. (00:16:45)
Episode #4.2 - S4-E2
Continuity mistake: The ladder carried by a bomber is a plain, ordinary ladder. After he puts it up against a post, it changes to an extendable one made up of three connected ladders.
Continuity mistake: In "Coach" (Season 3, Episode 7), Kate says that Mrs. Krupp's first name is Alice. However, in "CJ's Temptation" (Season 3, Episode 14) CJ says that Mrs. Krupp's first name is Mindy.