Facts and sources · Knock-Knee Alert (膝蓋警報)

Every claim in the narration and on screen, with its source and the quoted wording. Checked against the final script on 2026-10-20. The newsreel ("THE SPOTLIGHT NEWS", "ENTER MR. FORD", "THAT'S THE NEWS!") is invented packaging; the archive material and the facts are real.

Narration and on-screen text

F1 · the headline

• The Austin Statesman, Friday, March 5, 1926, page 6 (scan on Wikimedia Commons): https://commons.wikimedia.org/wiki/File:Austin_American_Statesman_1926-03-05_(page_6).jpg

  "Charleston To Make Us Knock-Kneed And Pigeon-Toed" (headline, read off the page) "Page 6—Friday, March 5, 1926. THE AUSTIN STATESMAN" (folio)

• The warning in the article comes from "Mrs. W. L. Keep, dancing teacher in Omaha", so the narration says only "Warning!" and does not call it a doctor's warning.

F2 · Broadway, 1923, and the craze

• Wikipedia, "Charleston (dance)": https://en.wikipedia.org/wiki/Charleston_(dance)

  "The rhythm was popularized in mainstream dance music in the United States by a 1923 tune called "The Charleston" by composer/pianist James P. Johnson, which originated in the Broadway show Runnin' Wild and became one of the most popular hits of the decade." "The Charleston dance's peak popularity occurred from mid-1926 to 1927."

• Wikipedia, "Charleston (1923 song)": https://en.wikipedia.org/wiki/Charleston_(1923_song)

  "The song was featured in the American black Broadway musical comedy show Runnin' Wild, which had its premiere at the New Colonial Theatre in New York on October 29, 1923."

• "Three years on, it's the rage!" is newsreel hyperbole resting on "peak popularity … mid-1926" (the film is dated March 1926 by its headline).

F3 · Bessie Love and Photoplay

• Wikipedia, "Charleston (dance)" (same page):

  "The accompanying instructions are quoted from the October 1925 issue of Photoplay, which published a nine-step guide to the Charleston featuring actress Bessie Love."

• Wikipedia, "Bessie Love": https://en.wikipedia.org/wiki/Bessie_Love

  "Because of her performance in The King on Main Street (1925), Love is credited with being the first person to dance the Charleston on film, popularizing it in the United States."

• The nine photographs: Wikimedia Commons, "Photoplay 1925-10 - Bessie Love - Charleston step 1–9", e.g. https://commons.wikimedia.org/wiki/File:Photoplay_1925-10_-Bessie_Love-_Charleston_step_1.jpg

  "Actress Bessie Love demonstrating the Charleston, 1925. STEP No. 1. …"

F4 · Henry Ford's old-time dance revival

• The Henry Ford (museum), "Henry Ford with His Old-time Dance Orchestra, 1933", THF108675: https://www.thehenryford.org/collections/explore/artifact/241031

  "Here, from the mid-1920s to the mid-1930s, Ford held his old-fashioned dancing parties for adults and hosted dance lessons for children. Ford's Old Time Orchestra provided the music, while Benjamin Lovett called the dance steps." (The room was "a dance room at Ford Motor Company's Engineering Lab", in Dearborn, Michigan, per the same record.)

• The Henry Ford, "Good Morning…" 1926, THF93574: https://www.thehenryford.org/collections/explore/artifact/254489

  "Henry Ford's "Good Morning" book provided illustrated instructions on the proper steps and deportment for old-fashioned dancing--it was part of Ford's crusade to revive the dances of his youth."

F5 · the book's words about jazz

• "Good Morning": After a Sleep of Twenty-five Years, Old-fashioned Dancing is Being Revived by Mr. and Mrs. Henry Ford, Dearborn Publishing Company, 1926, p. 30 (scan: https://archive.org/details/goodmorning0000unse, leaf 34):

  "The modern dances with their lesser demand for skill and spirit, their tuneless music, their tendency to jazz, their essential unsociability, are losing vogue everywhere."

• "His book": The Henry Ford calls it "Henry Ford's "Good Morning" book" (F4); the title page credits "Mr. and Mrs. Henry Ford", and the museum notes it was written by Ford's dancing master Benjamin Lovett. The film shows the title page and the printed sentence.

F6 · the films (U.S. National Archives, Ford Motor Company Film Collection)

Catalogue descriptions as given by NARA ("The original catalog description provided by the Ford Motor Company reads as follows"), via the Internet Archive FedFlix copies: - FC-4158, Second Annual Picnic and Outing Given by Employees of Ford Motor Company [1924] — https://archive.org/details/fc-fc-4158

"“Dancing in the pavilion.” Couples dancing. … “Old time dances -- reviving fond memories.” Couple and group dances. “Special events.” Men tap dancing in pavilion, people gathered around - close-ups of kids eating - kids doing the ‘Charleston.’ [1924]" The verdict sequence uses only the pavilion couples, the tap dancers ("Special events") and the kids doing the Charleston; the picnic's own "old time dances" are not shown, and the narration only claims the kids' Charleston. - FC-2307(a), Man Dancing [1925] — https://archive.org/details/fc-fc-2307a-b "Small band, elderly man dancing, Henry Ford and others watching. [1925]" - FC-2275(a), Small Orchestra Playing [1926] — https://archive.org/details/fc-fc-2275a-b "Small orchestra playing - close-up of violinist - orchestra - violinist - elderly woman dancing near orchestra - orchestra. [1926]" - FC-2292(c), Dancing at Botsford Inn [1927] — https://archive.org/details/fc-fc-2292a-c (NARA https://catalog.archives.gov/id/7419756) "Group of people dancing in a circle on a large field - residential area across street, automobile traffic. [1927]" - The film does not claim that the orchestra in FC-2275 is Ford's Old Time Orchestra, nor that the dancer in FC-2307 is Henry Ford; the tag says only "FORD FILMS 1925–26".

F7 · the record

• Internet Archive / UC Santa Barbara Library, edison-51542_01_10292: https://archive.org/details/edison-51542_01_10292

  "Composer: James P. Johnson · Main talent: Golden Gate Orchestra [California Ramblers] · Matrix number: 10292 · Catalog number: 51542" (date 1925-04-02)

• Discography of American Historical Recordings: https://adp.library.ucsb.edu/index.php/matrix/detail/2000157151
• Wikipedia, "Charleston (1923 song)":

  "One of the most famous recordings of the song was by The Golden Gate Orchestra in 1925, which has been inducted into the National Recording Registry."

Rights of the Ford films

• NARA, Prologue magazine, Winter 2014, "Ford Film Collection": https://www.archives.gov/publications/prologue/2014/winter/ford-film

  Ford Motor Company "transferred all rights to their surviving 1.5 million feet of motion pictures to the National Archives" (28 November 1962); "these films are now owned by the American people and are copyright- and royalty-free", except "a few films in the collection that were produced by Ford contractors".

• The NARA catalogue entry of FC-4158 adds: "All rights were conveyed to the U.S. Government on Nov. 28, 1962. However, proprietary rights or existing copyright in footage obtained from other sources by Ford Motor Company may exist." The films used are company record films (an employees' picnic, dances and music at Ford events); none is credited to an outside producer in its catalogue entry.