"Creature from the Haunted Sea" was shot in five days. Locals appeared in the film as extras, reportedly being paid $1 an hour. According to Corman, "I was trying to get more movement into long dialogue scenes. Chuck had one scene in the script that especially bothered me because I couldn't figure out how to give it some action. We were shooting in a palm grove, and I had these Americans playing touch football with a coconut[...]If nothing else, there was a lot of movement in that scene." During a scene in which the character Renzo Capetto is shown assembling an automatic pistol, actor Antony Carbone was given a real gun which fell apart unexpectedly. After shooting a take that "worked perfectly," Corman decided that the first take was funnier, and used it in the film with added narration to achieve humorous effect.