* ActingInTheDark: Alfred Hitchcock withheld the ending from the cast and crew until it was time to shoot it.
* ActorSharedBackground: Anthony Perkins lost his father at the age of five and was raised by his mother, like his character Norman.
* AffectionateParody / AdamWesting: Anthony Perkins hosted an episode in the first season of ''Series/SaturdayNightLive,'' which included an [[http://www.youtube.com/watch?v=bhhTb4SoaaU almost-obligatory, and hysterical, Norman Bates skit]].
** In 1990 (the same year that ''the Beginning'' was released), Perkins did an [[https://www.youtube.com/watch?v=c6s5DjcLWUI oatmeal commercial as Norman Bates.]]
** AFIS100Years100Movies: #18
** AFIS100Years100Thrills: #1
*** #2 Villain, Norman Bates
*** #56, "A boy's best friend is his mother."
** AFIS100YearsOfFilmScores: #4
** AFIS100Years100Movies10THAnniversaryEdition: #14
** The original book was this for Creator/RobertBloch, most of whose horror fiction involved the CthulhuMythos.
** It was also a BlackSheepHit for Hitchcock, who had never directed a horror film before.
* CreatorBacklash: Averted with Anthony Perkins. While acknowledging that starring in the film led to him being [[TypeCasting typecast]] as a maniac killer, when he was asked if he still would have taken the role knowing what it would do to his career, he replied with a definite "yes."
* DirectedByCastMember: Anthony Perkins directed the third movie.
* DoingItForTheArt: Hitchcock went to a ''lot'' of trouble to try and avoid the film's twists being revealed. Most notably, he went about buying up copies of the source novel out of his own pocket.
* EnforcedMethodActing: An urban legend is that Hitchcock arranged for the shower to suddenly go cold to get the appropriate screams out of Janet Leigh.
* GenreKiller: Many film historians consider ''Psycho'' to the be movie that killed FilmNoir, as the purpose of the first hour or so is to continuously set up and subvert the tropes of that genre.
* LifeImitatesArt: The shower scene ended up genuinely frightening Janet Leigh when she saw it back. Realising how vulnerable a woman was in the shower, she only ever took baths for the rest of her life.
* LyingCreator: Hitchcock lied to the press that he intended to cast Helen Hayes as Mrs Bates. Several actresses wrote to him looking for the part as a result.
* NotScreenedForCritics: Alfred Hitchcock actually played this card and then some in order to conceal the film's classic plot twist. This makes ''Psycho'' a rare example of a film NotScreenedForCritics that is acclaimed by them later.
* TheOtherMarty: There were rumours that George Reeves was originally cast as Arbogast and had already filmed some of his scenes by the time he died. As the script wasn't even started until four months after Reeves's death, this is quite unlikely.
* PlayingWithCharacterType: Bates initially appears to be the same sort of character Perkins was known for playing up to that time - a likeable, socially awkward supporting role. This makes the TwistEnding all the more shocking.
** The brief appearance of young Norman in ''Psycho II'' was by Anthony Perkins' son, Oz.
** Marion's co-worker Carolyn is played by the director's daughter Pat Hitchcock.
* RealitySubtext: Part of Hitchcock's love for the story was because he sympathised with Norman - having also grown up with a rather domineering mother. Thankfully she was not as bad as Mrs Bates. Likewise the screenwriter wrote the screenplay while he was in therapy, dealing with the troubled relationship with his own mother.
** Subverted yet played straight: History will tell you that ''Psycho'' was not a box-office nor a critical failure, and it's obviously considered one of the best films ever made. However, many consider it to be the film that simultaneously heightened and ruined Anthony Perkins's career as an actor because he was subject to typecasting afterwards, and most moviegoers [[IAmNotSpock only knew him as Norman Bates]]. Perkins never had any [[CreatorBacklash backlash]] because of it, but plenty of his fans will vouch Perkins was one of the most underrated actors in Hollywood history, and ''Psycho'' is to blame. Ironically enough, at the time ''Psycho'' was Perkins PlayingAgainstType. After ''Psycho,'' if there was a movie where he wasn't playing a "psycho," it was him playing against type again.
** The same applies to Janet Leigh. Although not subject to typecasting afterwards, pretty much all she is really remembered for was the shower scene.
** Location shooting (for the scene where Marion drives out of town with the money) was done in downtown Phoenix in December 1959. After [[DidIMentionItsChristmas Christmas decorations]] were discovered to be visible in the footage, a graphic was added to the beginning of the film setting the date as "Friday, December the Eleventh".
** Also, Norman's CharacterTic of eating candy was a suggestion of Perkins's that Hitchcock happened to like.
* UnintentionalPeriodPiece: Gus van Sant's 1999 remake, thanks to the only new line of dialogue van Sant put in the script. Creator/JulianneMoore as Lila is listening to a Sony Walkman when she's introduced, and she says "Let me get my Walkman" when she and Sam are leaving his hardware store.
** Hitchcock originally wanted the shower scene to play without music, but Herrmann begged him to try it. Yes, the TropeMaker for PsychoStrings very nearly didn't come about at all.
** He also wanted the opening zoom in to Marion's afternoon delight to be a [[TheOner single continuous shot]], but the technology to do this didn't exist at the time. Restoring that idea now that it did exist is pretty much the only legitimate reason for the existence of the Gus van Sant remake.