Presumably he was also using a lot of Frankenstein's science equipment and Dracula's books, too.

I feel that can't have helped his problems.

(One of the most happily unexpected moments of my movie-watching life involved recognizing the interiors of the tumbledown farmhouse in George Washington Slept Here (1942) as the interiors of the Brewster house in Arsenic and Old Lace (filmed 1941, released 1944). The staircase up which I watched John Alexander charge so many times in my childhood was unmistakable.)