Director Hy Averback said in an interview that one day, Peter Sellers refused to shoot a scene until a crew member standing off camera changed clothes. The superstitious Sellers claimed the outfit was the "wrong color". Shooting had to stop while they went to wardrobe and got a different color outfit for the crewmember.
The film's title is a tribute to Gertrude Stein's lifelong partner, Alice B. Toklas, who published a cookbook in 1954 that contained the first printed recipe for hash fudge. In one of the movie's most famous scene Harold Fine unknowingly serves some marijuana-laced brownies baked by Nancy to his parents and fiancée
Paul Mazursky:
as one of the hippies on the sidewalk at the half-way point and in the final scene.