The movie's title "Noises Off!" is a stage cue, used in plays, by a playwright, to indicate noises occurring off-stage.
The play on which this movie was based is done in three acts; Act 1 is the final dress rehearsal in January; Act 2 is a performance some time later; Act 3 is a performance in April. The bridge scenes, with Sir Michael Caine's voice-over narration, including the opening scene where he leaves the theater and the ending scene where he returns, were written for this movie, and do not appear in the play. In the play, the last line is the frantic call for "Curtain!"
The original Broadway production of "Noises Off!" by Michael Frayn opened on December 11, 1983 at the Brooks Atkinson Theater, running for 553 performances, with a cast that included Victor Garber and Dorothy Loudon, and received a nomination for the 1984 Tony Award for Best Play.
Gary (John Ritter) mispronounces Dotti's (Carol Burnett's) character "Mrs. Clackett's" name seven times: #1- Mrs. Crockett, #2- Mrs. Clockitt, #3- Mrs. Crackitt, #4- Mrs. Blackitt, #5- Mrs. Sprocket, #6- Mrs. Spratchit, #7- Mrs. Splotchit.