Watched this last night.
There's an 'end-credits' display with the heading "Beach Girls", and one for "Beach Boys"; these are the other kids in the movie. The group names make sense.
Listed fifth under "Beach Boys" is the name "Brian Wilson"! That brought a smile to my face.
I couldn't go back and search for him, and IMDB doesn't list him, which I find curious. Everybody else listed, yes.
Can anyone shed some light on this? It was southern California, in a beach movie in 1965. CERTAINLY, Brian Wilson's presence would be reasonable, even in a background novelty 'extra' role, done just for a lark.
If it WAS him, maybe IMDB was prevented from listing him, even though he's in the credits of the film? External forces couldn't effect the film at this date, certainly, but maybe they could stop IMDB!