 | Alice Faye | ... | Molly Adair Hayden |

| Don Ameche | ... | Michael Linnett 'Mike' Connors |
 | J. Edward Bromberg | ... | Dave Spingold |
 | Alan Curtis | ... | Nicky Hayden |
 | Stuart Erwin | ... | Pete Tinney, Michael's Cameraman |
 | Jed Prouty | ... | Keystone Cop Police Chief |

| Buster Keaton | ... | Himself |
 | Donald Meek | ... | Lyle P. Stout, Studio Chief |
 | George Givot | ... | Claude, an Englishman in the Show |

| Al Jolson | ... | Himself (as Mr. Al Jolson) |
 | Eddie Collins | ... | Keystone Cop Driver |
 | Ben Turpin | ... | Bartender in Western |
 | Chester Conklin | ... | Sheriff in Western |
 | Hank Mann | ... | Keystone Cop |
 | 'Snub' Pollard | ... | Keystone Cop (as Snub Pollard) |
 | Heinie Conklin | ... | Keystone Cop |
 | James Finlayson | ... | Keystone Cop |
 | Chick Chandler | ... | Chick, Assistant Director |
 | Robert Lowery | ... | Henry Potter in the Show |
 | Russell Hicks | ... | Mr. Roberts, Movie Backer |
 | Ben Welden | ... | Agent with Michael at Anniversary Party |
 | Willie Fung | ... | Willie, Michael's Valet |
 | Paul Stanton | ... | Filson (Credits) / Himself, an Actor |
 | Mary Forbes | ... | Mrs. Gaynes in the Show |
 | Joseph Crehan | ... | Bill, Mr. Thomas' Attorney |
 | Irving Bacon | ... | Bakery Clerk |
 | Marjorie Beebe | ... | Telephone Operator in Silent Film |
 | Frederick Burton | ... | Mr. Thomas of Famous Players |
 | Lee Duncan | ... | Himself - Rin Tin Tin's Owner |
 | Rin Tin Tin Jr. | ... | Rin-Tin-Tin |
| rest of cast listed alphabetically: |
 | Eddie Dunn | ... | (scenes deleted) |
 | Herbert Ashley | ... | Gus, Diner Proprietor (uncredited) |
 | Sam Ash | ... | Actor in 'Common Clay' (uncredited) |
 | Bonnie Bannon | ... | Pretty girl (uncredited) |
 | Lynn Bari | ... | Actress in 'The Man Who Came Back' (uncredited) |
 | John Butler | ... | Telegraph Operator (uncredited) |
 | Georgia Caine | ... | Reporter (uncredited) |
 | Ray Cooke | ... | First Cab Driver (uncredited) |
 | Jack Cooper | ... | Burglar (uncredited) |
 | Dorothy Dearing | ... | Girl with Michael at Anniversary Party (uncredited) |
 | Edward Earle | ... | Actor (uncredited) |
 | Franklyn Farnum | ... | Well-Wisher (uncredited) |
 | Arno Frey | ... | Maitre d'Hotel (uncredited) |
 | Harold Goodwin | ... | Prop Boy (uncredited) |
 | Fay Helm | ... | Nurse (uncredited) |
 | J. Anthony Hughes | ... | Motorcycle Policeman (uncredited) |
 | John Ince | ... | Actor as Court Officer (uncredited) |
 | Mark Jones | ... | Keystone Kop (uncredited) |
 | Paul McVey | ... | Stage Manager Announcing Understudy Will Perform (uncredited) |
 | Dave Morris | ... | Stooge (uncredited) |
 | Forbes Murray | ... | Criterion Theater Manager (uncredited) |
 | Alex Pollard | ... | Nicky's Butler (uncredited) |
 | Victor Potel | ... | Slim, a Counterman (uncredited) |
 | Arthur Rankin | ... | Assistant Cameraman (uncredited) |
 | Cyril Ring | ... | First Row Extra in Theater Audience (uncredited) |
 | Marshall Ruth | ... | Roscoe 'Fatty' Arbuckle (uncredited) |
 | Francis Sayles | ... | Second Cab Driver (uncredited) |
 | Mack Sennett | ... | Himself (uncredited) |
 | Iva Stewart | ... | Girl with Michael at Anniversary Party (uncredited) |
 | Fred 'Snowflake' Toones | ... | Train Porter (uncredited) |
 | Harry Tyler | ... | Studio Guide (uncredited) |
 | Billy Wayne | ... | Assistant Stage Manager (uncredited) |
In the earliest years of silent cinema, former prop boy Mike (Don Ameche) "discovers" a charming Broadway understudy, Molly (Alice Faye), and impulsively hires her to a personal contract to star in pictures. With Mike as director, Molly is set to appear in a film with Buster Keaton as her boyfriend -- but things get out of hand, the first day on the set.
By accident, Buster flings a custard pie into Molly's lovely face, thus throwing off the rhythm of their primly choreographed love scene. Soon Molly, Buster, and the "villain" of their scene (George Givot) are covered in custard, and the laughing and applauding onlookers convince Mike he's discovered a new screen genre. He milks it for all it's worth, launching a series of slapstick comedies -- with pies, bathing beauties, and Keystone-style Kops -- all featuring Molly, who becomes a big star.
If "Hollywood Cavalcade" had continued in this same vein, it would probably have become a classic. Instead, about halfway through, Mike makes the decision to turn Molly into a dramatic actress, starring in serious photoplays and leaving her slapstick days behind.
The film's second half turns maudlin when Molly, whose love for Mike seems unrequited, marries her new costar Nicky (Alan Curtis). Having lost his biggest star, Mike slides into despair, his films regularly losing money. Then Nicky is killed in a traffic accident and Molly teams up with Mike again. They make a hit picture, and discover that they've loved each other all along.
"Hollywood Cavalcade" marked two firsts for Alice Faye: her first Technicolor film, and also the first in which she sings not a single note. But her performance was generally lauded by the film critics.