When Terry uses a steam iron to kill a tarantula, she is shown wearing a sleeveless yellow tank top. However, in the close up of the spider being killed, someone else is obviously wielding the iron. The arm shown is much longer than Terry's, the shirt is a different color than the one she was shown wearing, and it has a sleeve which has been rolled up. After the spider is killed, Terry is once again shown wearing a sleeveless yellow tank top.
As Mr. Kester drives home from Helga's on the night of the revival, one shot shows daylight.
At minute 46:00 when the Sheriff drives up to a house, his tires are heard squealing on the pavement when he stops, except, the driveway is dirt. This oddity is carried on throughout the rest of the movie with multiple cars on dirt roads.
Repeatedly through the movie, the subtitles are left on the screen from one scene until someone in the next scene says a line. Several times, the scene shifts and several seconds go by before anything is said so as to change the subtitle.
When Dr.Vance and Dr. Langer are with the Sheriff in his office, the boom mic can be seen at the bottom of the frame, alternately pointing at each actor as they speak.
While talking to Billy on the phone late in the movie, the sheriff mispronounces Terry's name as "Jerry."