According to executive producer Richard Gordon, the theater in which The Great Vorelli performs was not open to the public at the time and was scheduled to be demolished. The film crew was able to shoot inside the theater for the show and backstage scenes before the deadline for the building's demolition.
Sidney J. Furie was originally supposed to direct, but he left for another project before shooting began, and it was assigned to Lindsay Shonteff. Furie, however, was a friend of Shonteff's and helped Shonteff with the direction of the picture when he ran into problems.
Like the ventriloquist dummy in the similar segment of Dead of Night (1945), the doll's name is Hugo.
Both William Sylvester (Mark English) and Alan Gifford (Bob Garrett) appeared in 2001: A Space Odyssey (1968), as Heywood Floyd and Poole's father, respectively.