* AFIS100YearsSeries:
** AFIS100Years100Movies: #41
** AFIS100Years100Passions: #3
** AFIS100Years100Songs:
*** #20, "Somewhere"
*** #35, "America"
*** #59, "Tonight"
** AFISGreatestMovieMusicals: #2
** AFIS100Years100Movies10THAnniversaryEdition: #51
* AdaptationalContextChange:
** The lyrics to "America" are given a different meaning from the musical to film adaptation. The original had been criticised for UnfortunateImplications that it was mocking Puerto Rico and Puerto Ricans. The film instead emphasise the discrimination the Puerto Ricans had suffered in America.
** In the film, "I Feel Pretty" and "Gee, Officer Krumpke" happen much earlier than they do in the stage version. In the stage version, they're meant to act as a tension break after the deaths in the first act. In the film, there are now no light moments after the rumble with the songs happening earlier.
* BreakthroughHit: Despite Sondheim disowning later on, this musical put him on the map as one of the most well-known writers on Broadway.
* CreatorBacklash:
** Stephen Sondheim doesn't think very highly of the lyrics he wrote for this. Some songs sound as simplistic as something a real New York teen would improvise ("Maria!/I've just met a girl named Maria/And suddenly that name/Will never be the same/To me.") while others sound too complex ("I feel pretty/Oh so pretty/I feel pretty and witty and gay!/And I pity/Any girl who isn't me today.").
** Richard Beymer later felt his performance as Tony was subpar. He felt there was too much dissonance between Tony's personality as a NiceGuy and his backstory - feeling Tony should have been a bit rougher. According to him, it was hard not to avoid {{Corpsing}} on some of the more romantic lines.
* DawsonCasting: Defied to an extent. Most of the original Broadway cast were rejected for the film version, being thought too old to believably play teenagers.
* DuelingWorks: With ''Romanoff & Juliet'', another film based on a Broadway version of ''Theatre/RomeoAndJuliet'' - this one being a Cold War satire.
* EnforcedMethodActing:
** While filming the movie, the actors playing the Jets and the Sharks were roomed separately in order to heighten the tension between the two groups. They were also encouraged to play pranks on each other off the set to keep up the tension. Russ Tamblyn claims that two actors from different sides roomed during filming anyway.
** Averted in "Anita's Rape Scene." In that scene, the actress playing Anita, Rita Moreno, was reduced to tears as a result of shooting that scene, as it brought back memories of when she was raped as a child. When she started crying, the actors playing the Jets immediately stopped what they were doing and began comforting her, while pointing out that the viewers were going to hate them for what they were doing.
* FakeNationality: In the film, Maria is played by Creator/NatalieWood, who was a Russian-American. And then there's the Greco-American George Chakiris as Bernardo.
* NonSingingVoice: Natalie Wood wanted to do her own singing and trained very hard for it, but she ended up dubbed by Marni Nixon. Nixon also supplied Rita Moreno with a few high notes in another number (something she would do for Moreno again in ''Film/TheKingAndI''. Betty Wand also dubbed Rita Moreno for "A Boy Like That", but Moreno sings "America" and "Quintet" herself. Tucker Smith (Ice) also dubbed Russ Tamblyn for "The Jet Song".
* ProductionPosse: One of the co-directors of the movie version, Creator/RobertWise, would later collaborate with the associate producer, Saul Chaplin, again on two Creator/JulieAndrews movie musicals: ''Theatre/TheSoundOfMusic'' and ''Star!''. The former also shares ''West Side Story'''s screenwriter, Ernest Lehman (who wrote four Wise-directed movies in total), and musical director, Irwin Kostal.
* TroubledProduction: During production of the movie version, Jerome Robbins, with his background in stage, shot and re-shot until the film was over $1,000,000 over budget and six months behind schedule. He was fired, and co-director Creator/RobertWise, who was supposed to helm only the non-dancing scenes, had to finish the film alone, including the numbers Robbins was supposed to direct. Despite directing the majority of the film (and also being the producer), Wise still insisted Robbins share the directing credit with him.
* WhatCouldHaveBeen:
** The first draft, ''East Side Story'', Tony was an Irish-Catholic and Maria a Jewish Holocaust survivor.
** An alternate opening showed the Jets in a clubhouse, fantasizing about going to the moon.
** Maria would have sung about the murderous power of hate, instead of making a dramatic speech.
** Early casting choices for the movie's Tony included Music/ElvisPresley and Creator/WarrenBeatty. Ironically, both of them had real-life affairs with NatalieWood. Audrey Hepburn was also offered the part of Maria, but turned it down because she was pregnant at the time.
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