The animated Thanksgiving sequence is a topical reference to President Roosevelt's failed attempt to change the date of the holiday.
The script originally called for a Labor Day dance number, "This Is a Great Country."
For the "drunk" dance, Fred Astaire had two drinks of bourbon before the first take and one before each succeeding take. The seventh (last) take was used in the film.
The firecracker dance sequence required 3 days of rehearsal and took two days to film. Fred Astaire's shoes for the dance were auctioned off for $116,000 worth of war bonds.
The proceeds from the New York City premiere went to the Navy Relief Society.
Irving Berlin got the idea for the film after writing the song "Easter Parade" for his 1933 show "As Thousands Cheer", and planned to write a play about American holidays, but it never materialized. He later pitched the idea to Mark Sandrich who got the ball rolling for this film.
Some controversy surrounded the history of the song "White Christmas" when it was reported in a 1960 news item that Berlin wrote the song in 1938, which would have made it ineligible for an Academy Award nomination. But a biography and modern sources agree it was written for this film, and the sheet music has a 1942 copyright date.
The film marked the debut of "White Christmas", which went on to become one of the biggest selling songs in the history of music.
When Irving Berlin won an Oscar for his song "White Christmas" from this movie, he became the first artist to present himself with an Academy Award.
The original title for "Easter Parade" was "Smile And Show Your Dimple".
As of 2007, "White Christmas" is the best selling music single ever.
The set of the Holiday Inn was reused by Paramount 12 years later for the musical White Christmas (1954), also starring Bing Crosby and composed by Irving Berlin.
Bing Crosby's original "Rhythm Boys" partner Harry Barris plays the orchestra leader in the nightclub scenes.
Founded in 1952, the Holiday Inn hotel chain took its name from this film.