The marquee advertises The Jazz Singer (1927) as being "all taking," which it was not, nor was it ever advertised as such.
Kurt Bergner said that John Gilbert's contract was ended when the sound film era began. In real life the transition to talkies was smoothly for Gilbert and he made various sound movies for MGM.
Buster Keaton started his acting role in the movies in "The Butcher Boy" in 1917, not in 1920 as shown in the movie.
Keaton's wife, a stylish studio employee, continues to wear WWI-era fashions well into the late Twenties-early Thirties.