Visible crew/equipment: During the dream sequence, when Gilligan starts a showdown with Mr. Howell and the Professor, someone's face appears in the window in the background for a second, and it's none of the castaways - someone in the filming crew most likely.
Visible crew/equipment: In the first scene of the episode, a crew member is visible through an open door beside the staircase.
Visible crew/equipment: Right after Samantha, Darrin and Tabitha pop out of the living room, the shadow of what looks like a camera rolling backwards can be seen on the floor. (00:21:55)
The Great Treasure Hunt - S2-E19
Visible crew/equipment: When Morticia bounces the anchor on the floor, the wire used to make it bounce is visible when she puts it down.