In case you didn't notice, all of the couples in this film are mixed-race marriages, white and black. In 1935 when this film was released, most US states had so-called anti-miscegenation laws, which prohibited interracial marriage. It wasn't until 32 years after this film was released that the Supreme Court ruled that those laws were unconstitutional.
This film was way ahead of its time by showing interracial marriage in 1935.
Also in the film, one of the black characters does the moonwalk dance while he's on the moon. 😆 (The moonwalk was popularized by Michael Jackson nearly 50 years later.) The moonwalk is attributed to Cab Calloway, who first demonstrated it a couple years earlier in 1932.
This film is only the second time that the moonwalk was featured in a cartoon, the first being "The Old Man of the Mountain" in 1933, also produced by Max Fleischer and scored/voiced by Cab Calloway and his Orchestra. (That cartoon actually used Calloway's dance moves and a rotoscope to produce that cartoon.)