I cannot believe you guys! All this claptrap and no mention of Joan Staley's infamous underwater swimming scene?!?
I saw this movie when it was first released and I was barely pubescent at that time. The audience was quietly taking in the Verneian antics of our shanghaied duo, until one of the main characters (I forget which) runs off for a swim with the Joan Staley character (Deena).
OK, so Deena takes off her prehistoric sunsuit and lo and behold she is wearing a Stone-Age bikini! OK, nothing to get excited about --- pretty chaste even for 1961. No elastic in prehistoric times, though, so the top fits rather loosely.
So the couple jump in the lagoon and start playfully swimming and diving underwater. The decent underwater cinematography lingers on each of the characters as they cavort about.
It quickly becomes evident that Deena's bikini top is not going to hold her fairly ample anatomy securely in hiding from the voyeurs in the audience.
I will never forget the eruption of hoots and whistles from the darkened theater as the camera continued to follow Ms. Staley from such a point of view as to make it all too evident that Deena would have no trouble feeding any of her progeny, especially considering the equipment on display.
Granted, this sort of thing hardly rates the consideration of a PG rating today, but in 1961, it was dynamite. I was at a point in my development where the fuss being made by the male members of the audience only served to make me embarrassed and uncomfortable. The scene seemed to go on forever.
I was elated to be able to get recently a VHS copy of the movie (recorded, believe it or not, from a TV presentation), and waited breathlessly for the scene burned into my mind as a young lad.
And there it was in all its glory. And every bit as provocative as it was in that little Galveston, Texas theater back in '61.
One of the best bits of vintage, unexpected cinematic cheesecake I have ever had the pleasure to encounter.