On the first day of filming his nude scenes, Warren Raum suffered severe sunburn on his buttocks, so much so that shooting had to be postponed while he recovered.
Warren Raum and Ryp Siani were both director Ralph Bluemke's first choices for the two main roles. Luckily, both boys and their parents consented to the extensive nudity in the script.
The film was shot on location on Vieques Island in Puerto Rico, the same island on which Lord of the Flies was filmed only five years earlier. Both films are about boys stranded on a desert island without adult supervision.
Prior to filming, none of the cast and crew were nudists. However, since most of their scenes were filmed in the nude, Warren Raum and Ryp Siani soon became accustomed to not wearing clothes unless it was required for a particular scene, and often wandered amongst the crew stark naked even when not filming. Much of the crew also joined in skinny dipping with the boys during lunch breaks.
When cinematographer Al Mozell asked director Ralph Bluemke how far he wanted to go in showing actors Warren Raum and Ryp Siani's naked bodies, Bluemke told him to simply film the boys as if they were wearing clothes. Mozell reluctantly agreed, but warned, "Okay, but nudity is a no-no."