When Shaggy calls the sheriff his mouth disappears at 6:29.
The audience sees a hand switch on the heater to defrost the caveman just seconds before the camera pans to the right where Professor Ingstrom and Professor Wayne are together.
It is later revealed that Professor Wayne is behind the resurrection of the caveman, and a flashback reveals he is the one who switched on the electric heater.
However, he couldn't have been the hand shown, as he is working on the other end of the room when the heater is switched on.
It is later revealed that Professor Wayne is behind the resurrection of the caveman, and a flashback reveals he is the one who switched on the electric heater.
However, he couldn't have been the hand shown, as he is working on the other end of the room when the heater is switched on.
When the gang spotted Professor Ingstrom communicating with a dolphin, Velma says, "Is he talking to that fish, or am I dreaming?" Dolphins (and other cetaceans) are actually mammals, not fish.