In an interview Arlene Dahl said that her solo "I Love You So Much" was difficult because she had to remember the song lyric while descending a stair case without tripping. She said that Fred Astaire used to stop by rehearsal almost every day and give her tips on how to do it.
Near the end of the film, which is set in Southern California, Red Skelton as Harry Ruby says he's going to Wrigley Field to watch a doubleheader. He's referring to the original Wrigley Filed which was in Los Angeles. (In that time period, present-day Wrigley Field in Chicago was called Cubs Park.)
The trivia item below may give away important plot points.
According to supplementary material included on the DVD much of this film was fiction. Because Kalmar and Ruby got along well all their lives the writers had to make up some conflict to add interest. Ruby never ruined Kalmar's magic act, Kalmar never wrote a stage play so the friction between them over Ruby's sabotage never happened. They did not "discover" Helen Kane as a young girl on the sidewalk. The title song, "Three Little Words", was written for a movie and did not take years to complete. While Kalmar and Ruby did pursue careers apart for several years, they never had the clash shown in the movie and remained good friends all their lives. Kalmar died shortly after agreeing to let MGM make the movie but before filming began.