When Hubie rides his bicycle early in the film, his helmet is unbuckled. Suddenly, it's buckled for the last 2 frames with no time for him to have done it.
The Salem Police station is depicted as a small stone building on a quaint street. In reality it is a large modern brick facility next to a railroad near the city center.
In the closing credits, Dan Patrick is listed as the "principle". It should be the "principal".
The stalks of corn in the corn maze are fresh and green. On October 31 in Massachusetts, the cornstalks would be dried-out and brown.
Salem, Massachusetts is depicted as having farmland and a drive-in theater. In reality it is a small coastal city with a state university, a large hospital, and a former Coast Guard air station.