Continuity: When Mike is making Frankie the "morning after" hangover remedy, he grabs a can of Pepsi, but in the next shot, it's Folgers coffee, then it's Pepsi again.
Revealing mistakes: During a long dolly shot of the singing cast marching down the beach, wheel tracks in the sand from the camera car are visible.
Continuity: The initial external shot of the airborne Boeing 747 is a full-length version of the plane. Upon landing, it is clearly the much-shorter "SP" version of a TWA 747.
Continuity: During the Big Beach Bonfire Party, Annette starts out wearing a red sweater over a gold top and gold pants. A minute later, she's wearing a bright pink outfit with a polka-dot skirt, and in the very next scene she's back in the original outfit.