When Cliff comes over and sits next to Frasier, Sam moves Lilith's drink to below the bar. In the next shot it's back in front of Cliff, and remains there the rest of the scene.
When Frasier, Cliff, Norm and Sam are talking about taking their road trip, Cliff is sitting at the opposite end of the bar from Norm, next to Frasier. A glass of beer keeps appearing and disappearing in front of Cliff from shot to shot.
When the guys wake up in the morning, the sky remains dark and unchanged from the night before, even though Frasier says it is almost sunrise.
The wrinkles in the desert night backdrop are visible where the guys are stranded.
The front edge of the "carpet" that simulates the desert floor is visible in several scenes.