The film is significantly different from the Broadway musical. In the stage version, Sally Bowles is English (as she was in Christopher Isherwood's "Goodbye to Berlin"). In the film version, she is American. The character of Cliff Bradshaw was renamed Brian Roberts and made British (as was Isherwood, upon whom the character was based) rather than American as in the stage version. The characters and plot lines involving Fritz, Natalia and Max were pulled from "I Am a Camera" and did not appear in the stage version of "Cabaret" (or in "Goodbye to Berlin").