Continuity mistake: When Ethel, Lynne, Brenda and Bobby are sitting around the table outside the caravan, talking, the position of the juice pitcher, ketchup bottle and mustard bottle constantly changes. (00:27:30)
Continuity mistake: When Doug is walking across the desert, soon before he and Bob leave for help, he walks into shot with Brenda in the background laying back on her lounger and the bottle of lotion is lying on the ground beside her. In the next closeup the bottle of lotion is suddenly standing upright, beside her lounger. (00:23:40)
Answer: Pluto puts his hand over Brenda's mouth and Ethel doesn't bother to look over.