Goofs

The two skulls on the back of Dr. Acula's séance chair tilt and turn different directions between shots.

The house on Willows Lake made its original appearance in Bride of the Monster (1955), where it was known as The Willows House on Lake Marsh. Since burning down and being rebuilt, it became a single floor ranch (it was a rather large Victorian in BOTM). Later in the movie, the house is shown to once again be a large house via staircases and a tremendous amount of rooms.

Lt. Bradford recalls the staircase that leads up to the lab from when he was there before to bust Vornoff. In Bride of the Monster (1955), the lab was actually below ground.

When the old couple are driving down the road, the man constantly moves the steering wheel left and right, despite doing in a straight line.

In the scene that features the two teenagers in the car, the film suddenly speeds up tremendously. The whole scene was shot in 1910s silent film style.