When Melissa is in Abner Devereaux's workshop, looking for her fiancé, an animatronic barbershop quartet is in various stages of assembly. Far left is just a head. They are activated and sing a bit, panning to the right. At the start, the head on the table is facing left. When the camera pans back, the head is facing the camera.
When Gene sets the mummy on fire, the flames apparently spread much faster than intended. The stunt man playing the mummy says "Shit!" as he stumbles backwards. It's a made-for-TV movie aimed at children, so the language was not intentional.