Continuity mistake: When Samantha opens the door, you can see the 3 pictures by the door. The middle picture is straight. When the camera cuts to Samantha and Aunt Clara and returns to Larry at the door, the middle picture is crooked... a necessary plot point to distract Larry from the desk in the stair case.
Continuity mistake: When the coven is reading the case against Clara, the gavel is lying in the middle of Judge Bean's Bench. The camera cuts to Darrin then returns to the Coven, who is still reading their case against Clara. The gavel is suddenly on the wooden platform. There is no indication the gavel had been used as the coven is still reading their case against Clara.