Continuity: When Sutwell succeeds in surfing, the long shots show him with his cap still on. In close-ups he is bareheaded.
Continuity: At the end when Von Zipper says "I will return!" to the beach gang, it's still daylight. But seconds before, the gang is gathered around a campfire and it's pitch dark.
Continuity: Early in the film, when Frankie and Delores drive onto the beach towards their beach house for the first time, there's already a set of tire tracks in the sand from a previous take.