Errors made by characters (possibly deliberate errors by the filmmakers): On opening night of "The Mikado", Mr. Gilbert stands outside Mr. Grosssmith's dressing room door and wishes him "good luck". As any theater professional is well aware, it is, in the industry, considered extremely bad luck to wish an actor "good luck" prior to a performance - the proper expression is "break a leg", which was certainly well known and in common use during Gilbert's era. It is therefore highly unlikely and implausible that a savvy and experienced show business professional like Mr. Gilbert would defy hundreds of years of theater tradition and dare to say "good luck" to an actor on opening night. (Of course, Mr. Gilbert was extremely nervous at the time so there's always the possibility that he slipped up and said it inadvertently.)
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