Ruggles mispronounces the Ohio town of Xenia as "ZENN-ya" instead of the correct "ZEEN-ya."
Both times when the maid tells Marilyn and then Frank that Ziegfeld is on the phone, she pronounces it as "Ziegfield."
When Marilyn Miller returns to New York from London in 1914, the Empire State Building and the Chrysler Building are seen on the New York skyline. These were not built until the 1920s (the Empire State was finished and opened in 1931).
In the opening framing sequence, late-1940's model cars are seen in the background as the camera shows the theater where Marilyn Miller is going to star in a revival of "Sally." Marilyn Miller died in 1936.
When Marilyn Miller rehearses for the "Profiles of 1914," the troupe is performing a George Gershwin song, "Oh Gee! Oh Joy!," that wasn't written until 1927.