The Two Casts of Psycho
Given the interesting structure of Psycho, it pretty much has not only "two halfs" of a storyline(roughly, Marion's Story and Norman's Story), but two entirely different casts -- with but a tiny few crossovers from Part One to Part Two. Two in fact.
Cast of part one:
Janet Leigh(Marion Crane)
John Gavin(Sam Loomis)
Vaughn Taylor(Lowery)
Frank Albertson (Cassidy)
Pat Hitchocck (Caroline)
Mort Mills(Highway Cop)
John Anderson(California Charlie)
Anthony Perkins(Norman Bates)
Cast of part two
Anthony Perkins (Norman Bates)
John Gavin(Sam Loomis)
Vera Miles(Lila Crane)
Martin Balsam(Arbogast)
John McIntire (Sheriff Chambers)
Lurene Tuttle (Mrs. Chambers)
Simon Oakland(The psychiatrist)
Assorted guys(The DA, the main sheriff, two cell cops, one played by Ted Knight.)
Its interesting to think about not only how DIFFERENT part one and part two of Psycho are from each other, but how different the two casts are.
Now, two actors cross over into both parts: Anthony Perkins and John Gavin. Its almost a "luck of the draw thing." For this to work, Gavin literally has to "fly into" Marion's story(with his visit to Phoenix.) And Anthony Perkins shows up at the very end of Marion's story(really kinda sorta beginning Part Two by overlapping with Marion's story here.)
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As a logistical matter, I can see Hitchcock working closely with his casting director and with actors' agents to book all these folks for limited periods only.
I would assume that Vaughn Taylor, Frank Albertson and John Anderson only worked about two days each, probably moving on to Psycho from another set(maybe a TV show) and then moving on to the NEXT set(maybe another TV show.)
But this: think about how the actors in Part One likely never met the actors in Part Two -- they only saw them when they saw the movie.
I have read something interesting though: Janet Leigh and Martin Balsam had no scenes together in Psycho -- she's gone before he comes in -- but somehow they met during the production and really hit it off. Said Janet Leigh.
And: Anthony Perkins and John Gavin got into "Part One"(Marion's story) because each man had a scene with Janet Leigh. But there no plot reasons for Perkins or Gavin to meet anybody else in part one.
Meanwhile, Perkins only plays scenes in Part Two with Balsam, and Gavin(with a little interaction with Miles.) Though we are told that Norman MET WITH Sheriff Chambers on Sunday morning of the climax day, and we hear Chambers end only of a conversation with Norman. So we can IMAGINE Anthony Perkins acting his unseen scenes with John McIntire.
I'm not quite sure why I'm lingering on this. Perhaps this reason: in many movies, a main group of characters are assembled and pretty much go through the movie together. Think of the characters in Rear Window or The Trouble With Harry in Hitchocck. In Psycho, people come on the screen and then disappear and we never see them again, and the "heroine" baton is passed from Janet Leigh(Part One) to Vera Miles(Part Two.)
Its just another thing that makes Psycho different and unique among film narratives.