The Apple was conceived in 1977 by creators Coby Recht and Iris Yotvat as a Hebrew stage musical.

Principal photography of The Apple took place in Berlin between September and December of 1979.

The cast and crew were billeted at Berlin's Hotel Am Zoo, where Michael Caine's slacker spy Harry Palmer stayed in the film Funeral in Berlin (1966).

Most interiors were filmed at CCC Film Studio.

Catherine Mary Stewart had never acted and was studying dance in London when she tagged along with friends to The Apple auditions and walked away with a lead role.

Stewart's musical vocals were provided by Grammy-winning session singer Mary Hylan.

One of the background dancers in the film is Finola Hughes, who would later have her own shot at stardom by starring with John Travolta in Staying Alive (1983), the belated sequel to Saturday Night Fever (1977).

The film's concert scenes were shot inside the Main Hall of Berlin's International Congress Center.

Concert extras were comprised mostly of the children of American servicemen and were paid 50 Deutschmarks for one day of work.

In true Boogalowian fashion, Iris Yotvat has claimed she and fellow Apple creator Coby Recht were never paid by Menahem Golan for their services.

compiled by Richard Harland Smith

Sources:
Catherine Mary Stewart Interview by Monika Guttman, Splice, 1987
Catherine Mary Stewart Interview by David Holmes, 1993
80s Movie Rewind, fast-rewind.com