A scene set at the Summit Inn shortly after midnight was obviously shot during the daytime.
As Perry and Paul enter the front door of Jane Wardman's house, they cast multiple overlapping shadows onto the open door betraying obvious artificial lighting instead of the expected natural sunlight originating from the sky.
When Jane and her son are driving home, there is no dashboard showing from the frontal shots. The dashboard appears from rear shots.
In the scene where motorcycle riders were chasing Jane and her son, outside views show 1962 Mercury Meteor. Inside views and close-up views show 1960 full-size Mercury.
Edgar Buchanan's character is credited as "Edward Daley" in the credits, but the window of his office reads "Edward Daily".