Annette Funicello was pregnant during filming. She was shot mainly in close-up or wearing baggy clothing to hide her belly.
The last "Beach Party" film to feature Frankie Avalon and Annette Funicello. Because Avalon asked producers Samuel Z. Arkoff and James H. Nicholson for more money, his role was cut down to what amounts to a small cameo of about six minutes of screen time.
Unlike the other movies in the series which announce the sequel at the end of the credits, this movie tells the audience to 'watch for' Sergeant Dead Head (1965) which was not part of the series though had many cast members in common.
When the German Girl, Uta Stone, sees some beach girls riding on the shoulders of the boys, and they pull down the riders and knock each other down to the ground, Uta says in German: "Wenn ich diesen Tanz in Deutschland tanze, bringt man mich ins Irrenanstalt." Which translates as: "If I'd dance this dance in Germany, they'd take me to the lunatic asylum." But the English caption on the screen reads: "These Americans are more crazier than I thought" - which is quite different.
Features the only big screen appearance by The Kingsmen, famous for their hit version of "Louie Louie". Decked out in matching yellow blazers, the band did not perform that song and instead performed "Give Her Lovin'".
Elizabeth Montgomery: as the witch doctor's daughter, as a favor to her then-husband, director William Asher. (Her father on Bewitched (1964), the series she and Asher made together, was played by Maurice Evans.)