Deadeye Dick - S5-E9
Visible crew/equipment: In the scene where Trampas says, "You can bet no matter what happens, I will be blamed for it," as Sara Lane turns to ride away you can see a Chevy truck for about four seconds. The time left on the counter is between 29 and 28 minutes.
Christmas Special 1974 (a.k.a. A Perfect Christmas) - S8-E7
Visible crew/equipment: Christmas Special 1974: When Harold is playing with the toy bus you can see the camera reflected in its windows.
Visible crew/equipment: Season 3, "Birthday Cake": When Littlejohn goes into the river, you can see the reflection of the entire camera crew.
Visible crew/equipment: 2/3rds into the show, in Binghamton's office, Ensign Parker is making believe he is a Royal Navy Admiral and McHale introduces himself. The camera zooms in and the shadow of the equipment goes across Binghamton. He even looks at it but goes on with the scene.