- The original stage version of Maria's song "I Feel Pretty" included the lyrics "I feel pretty and witty and bright / And I pity / Any girl who isn't me tonight." In the film this night scene was changed to the daytime, and presumably for this reason, the rhyming words "bright" and "tonight" were changed to "gay" and "today."
- Borrowed its plot from William Shakespeare's "Romeo and Juliet".
- Natalie Wood's singing was dubbed by Marni Nixon.
- The actors in the rival gangs were instructed to play pranks on each other off the set to keep tensions high.
- Richard Beymer's singing voice was dubbed by Jimmy Bryant.
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