Visible crew/equipment: When Martin is fighting the "puppy" at the door, you can see a crew member's hand pushing the doorknob open to portray the puppy is trying to get back into the room.
Martin (1992)
1 visible crew/equipment mistake in season 3 - chronological order
The Great Payne Robbery - S1-E11
Revealing mistake: Watch as the corrupt officer comes in to rob the Paynes. It's dark and Gina supposedly has tackled him, but you can see the officer kneel down and then Gina goes over to him to make it look as if she tackled him down when the lights came back on.
Martin: Pam, is that your breath smellin' like boiled bologna?
Pam: No, that's yo' feet eatin' through those shoes again.