Visible crew/equipment: When Bette Midler and Shelly Long have just found out Michael Saunters is the bad guy, there is a helicopter looking for them and they're standing in the outdoor shower stall. Bette Midler says "They're the good guys" and they run out to try to get the helicopter's attention. Right after they run out of the stall, you can easily see one or two men in the stall - they're either holding the stall up against the wind of the helicopter or they're there for some other unexplainable reason.
Revealing mistake: Shelly Long and Bette Midler are running on the beach trying to get in the helicopter's light. In the far shot, when they are running out from under some structure, you can EASILY see that it is two men in drag. They are taller, a bit more "husky" and are having a hard time running in heels.