Revealing mistake: When WD-40 is parachuting onto the island at the beginning, he throws a match through his parachute. As the shot changes, you can clearly see the smoke canister that was producing the effect of the parachute being on fire, swinging from beneath the canopy.
Visible crew/equipment: In the scene near the end of the film, when Steele gets out of a Volkswagen Beetle, as he opens the car door the reflection of the cameraman and some crew members are visible.
Factual error: When WD-40 is at the restaurant, the waiter starts talking about himself. He tells the agent he drives a 1969 Ford Pinto, but the Pinto wasn't introduced until 1971.
Revealing mistake: When it shows the guy who had his arms blown off when he isn't wearing fake arms, his body is obviously wider, indicating that he hid his arms under his shirt.
Continuity mistake: In the first sequence, when Victoria Dahl falls from a cliff, several shots show her from above and from the same level as she clings to Dick Steele's hand and starts to fall, then a last shot shows her from below as she wags her arms in an attempt to reach the water safely. In the first shots she is wearing sandals, whereas in the shot from below she (perhaps a stunt-woman) is wearing closed shoes.