It is obvious that a body double was used when Margaret gets out of bed naked. She is skinnier and her breasts are smaller.
In the close up, insert shot showing Fuchs (Andrew Keir) opening the box containing the mummy's severed hand, two hands lift the lid despite Fuchs being completely paralysed down one side.
Screen credit is given to Bram Stoker for the novel 'Jewel of the Seven Stars'. The title is actually 'The Jewel of Seven Stars'.
Todd drives off to 'get help.' You see his car racing down the road. Margaret uses her ancient powers to raise a wind that flips the roof of Todd's convertible to vertical. As Todd reaches up to try to lower the roof, you can see grass around the car, and the car is clearly not moving! Next moment the car hits a tree.
In the beginning of the movie when the priest starts to put the funnel type instrument into the nostril of the dead or unconscious queen's nose, you can see her eyelids twitch when it makes contact with her skin.
In the burial scene the dead princess is still breathing.
Every time the sarcophagus is opened, the lid is simply slid across. Yet the girl inside, headdress and all, is elevated above the base by at least 6 inches.
Although Tera's right hand is completely severed by the adze, the scar on Margaret's wrist is only evident on the underside and does not extend to the front.