The bulk of the filming for this episode took place in December 1977 - tinsel is visible in the background in some of the scenes inside the bowling alley.
Production on this first season had fallen severely behind schedule. In an attempt to get it back on track, this episode was deliberately written to be shot very quickly, hence the use of few locations and the exteriors being shot after dark (while production on a few other episodes was still in progress during the daytime). However the acoustics in the bowling alley made it extremely difficult to record usable audio and the story actually took over a month to complete.