"Lux Radio Theater" broadcast a 60 minute radio adaptation of the movie onSeptember 6, 1948 with William Powell reprising his film role.
"Mr. Peabody and the Mermaid" was shooting near a set where "Abbott and Costello Meet Frankenstein" was filming. Tourists were shocked to see Glenn Strange's Frankenstein Monster having lunch with Ann Blyth in her fishtail costume. Both Strange and Lon Chaney in his Wolfman make-up were invited to the Mr. Peabody wrap party, where they hammed it up in make-up.
During the film Ann Blyth has no dialogue. She laughs, sings (without words) and cries but does not talk.
In an article in "Look" magazine that came out at the time the film was released Ann Blyth said that the hardest part of making the movie was trying to learn to swim while wearing the mermaid tail. She said that she practiced for more than a week before she felt comfortable with not being able to kick her legs to help her swim.