- Deborah Kerr's singing was dubbed by Marni Nixon.
- Although this movie was filmed and promoted in the then-new 55mm CinemaScope 55, it was actually shown in the standard 35mm CinemaScope, with 4-channel stereo rather than the 6-channel stereo originally promised. CinemaScope 55 was never used or promoted again after this production.
- At one point, Fox executives suggested that the story be changed so that the King would be gored by a white elephant, rather than become ill because of a personal humiliation.
- Dorothy Dandridge was the original choice for the role of Tuptim, but turned it down. The role later went to Rita Moreno.
- In Thailand (previously called Siam) the Royal family is held in very high esteem. The King and I is banned in Thailand due historical inaccuracy and perceived disrespect of the monarchy. The real Prince Chulalongkorn grew up to be an especially good king and led the way for modernization, improved relations with the west, and instituted many important cultural and social reforms in Thailand.
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