Continuity mistake: After the Big Rolling Turd has rolled backwards over the grocery carts, in the shot of the RV heading down the highway the back center window curtain is hardly open. In the following interior shots, as they sing, the entire curtain is open, but in the last exterior shot it is hardly open again.
Continuity mistake: In the scene when Bob is on top of the Gornecke's RV, and they stop suddenly, you can see that the gates of the Alpine beverages company are a distance away. However when they walk around the front of the bus in the next shot, it is as though they pulled up right in front of them.
Continuity mistake: When Mary Jo begins walking to the RV at 6:00 AM, Bob and Carl remove the tire blocks outside, while Jamie closes the "stupid pop-out thing" inside. In the exterior shot, as it slides in, Bob is sitting with his hand on the steering wheel - though it isn't until two shots later that Bob actually gets back to the driver's seat.
Continuity mistake: When Bob drives up Diablo Pass and ends up teetering on the mountain, his seatbelt is strapped across his chest. After the first close-up of the speedometer, his seatbelt is off as his foot steps on the accelerator, but after second close-up of the speedometer his seatbelt is still on.