"Let's Scare Jessica to Death" was filmed over a period of 26 days in the fall of 1970, in various towns in Connecticut; the production budget was $250,000. Principal photography began in November of that year in Old Saybrook. The exteriors of the house were shot at a farmhouse in Old Saybrook, while the E.E. Dickinson Mansion, located in the village of Essex, was used for the interior shots of the home. While shooting, the cast and crew used multiple rooms in the expansive mansion for dressing rooms and a headquarters for the film company.