Sonny Bono says that he forgot the spare tire, but there is a spare tire clearly visible on the side of the car.
A few seconds before Mr. Meekly says, "want all of your children in the same room", the bell on his desk disappears.
When the gang is driving across the bridge to Shark Island, a big truck passes them and the Mystery Machine hangs off the edge. Fred asks if anyone got the license number and Sonny Bono says, "No, but I'd recognize that dirty laugh anywhere." Sonny's lips don't move.
When coming back up for air, Fred says he couldn't hold his breath any longer. Velma agrees, but it comes out of Daphne's mouth.
When Cher asks to look at the brochure when Sonny Bono mentions golf, "Hideaway Hotel" on the brochure is misspelled "Hideway Hotel".