Jennings' eye patch disappears and reappears several times during the fight in the back of the truck.
A radio news report recounting the events of the previous film, The Touch of Her Flesh (1967), refers to Angelique Pettyjohn's character as the killer's third victim, when she was in fact that film's survivor. Even if she was killed off-camera between the two films, she would have been the fifth victim and not the third.
A female crew member can be seen sitting on a mattress in the corner of the truck during the fight scene.