T-R-A-Something-Something Spells Tramp - S7-E2
Visible crew/equipment: When Jefferson talks about his little impotence problem, you can suddenly see a shadow walking from left to right across the whole set. (00:14:25)
Visible crew/equipment: In the scene where the Bundys are riding around the city in their loaner Lincoln Town Car, you can see an unlit Klieg light on top of one of the buildings revealing that one of their rare outdoor locations is actually on the back lot.
Answer: It was one of the hoses connected to the engine, nothing specific, but to indicate that Al tampered with the vehicle.