Continuity mistake: When Sabrina and Valerie are in the cafeteria sitting at the table Valerie is holding her drink, the shot changes and she is now holding a spoon. (00:05:30)
First Kiss - S1-E17
Visible crew/equipment: At the end of the episode when Harvey hops away, a boom mic is visible. (00:21:55)
Third Aunt From the Sun - S1-E7
Visible crew/equipment: When Sabrina is singing the Funky Song, you can see the fake room in which this scene was filmed. (00:18:35)
Revealing mistake: Near the end of the episode, Sabrina accidentally hits the football player in the eye by jumping happily. But you can see that Sabrina did not even touch him. (00:20:10)
Answer: In the S6 E18, "I, Busybody" Salem got permission from the Witch's Council to be human for one day to meet his pen pal, Roxie. It was all a point of view camera shot.