 The movie billboard behind Steve Martin (I) (qv) when he is trying  to break into the studio to retrieve the Three Amigos costumes is an  advertisement for the movie "The Dueling Cavalier" starring Miss  Reynolds. Debbie Reynolds (I) (qv) starred in  _Singin in the Rain (1952)_ (qv) in which the talkie movie they  were trying to make was called, "The Dueling Cavalier".