Trivia

The astronomer is a caricature of cartoon director Friz Freleng.

The science professor's note of resignation reads: "SHALOMAR OBSERVATORY I resign! When I begin to see things like this, it's time to take up turkey farming. J. Frisby DIRECTOR"

The scene where J. Frisby sees Saturn, Jupiter, stars and a quarter moon, before he writes his resignation note, has been cut from more than half of the versions of this film.

The second appearance of Marvin the Martian, after the character's debut in El Conejo Astronauta (1948).

Shalomar Observatory is a pun on the famous Palomar Observatory in California.