The title is a play on "daredevil."
Bugs Bunny is tricked into being the first rabbit to go to the moon. When he lands on the moon he finds Marvin the Martian about to blow up the Earth with his Uranium PU36 Explosive Space Modulator. Bugs deals with the Martian. However, Marvin calls in the reserves, which proves to be a green Martian dog called K-9. Bugs outwits both K-9 and Marvin by stealing the modulator. He gives it back, intending to blow up Marvin, but blows up the moon instead, leaving Bugs, Marvin and K-9 stranded on the moon's remains in the middle of outer space.
- "Haredevil Hare" marks the debut of Marvin the Martian and his martian pet dog K-9, who spoke in this short.
- Marvin's nasal voice in this short sounds a lot different from other appearances. In his next appearance, "The Hasty Hare", Marvin gets his familiar nasal voice which would continue to be used in later appearances. His familiar nasal voice is actually based on the voice from the unseen emcee who says this one line "Shall we give it to him, folks?" from "What's Cookin' Doc?"
- In addition, Marvin's character design in his debut cartoon is slightly different, as he originally had larger eyes. Beginning with The Hasty Hare, Marvin is redesigned slightly to have smaller eyes. Marvin would reappear in his original character design from this cartoon in Looney Tunes Cartoons.
- Mel Blanc creates the sound of the Martian's bugle by simultaneously vocalizing and squeezing his hands together in rhythm.
- This was the latest cartoon that was sold to Associated Artists Productions in 1956. This is also Bugs Bunny's final cartoon in the a.a.p. package and Marvin the Martian's only short in the a.a.p. package.
- "Kilroy was here" is scrawled on one of the rocks Bugs strolls past on the moon. This phrase originates from the graffiti used by GIs around the world during World War II, and was found on fences and buildings all over Europe. The origin supposedly lay in a US Army sergeant who, after checking equipment, would write on it "Kilroy was here". Usually, it was accompanied by a little peeking, bulbous-nosed figure.
- Shortly after the rocket's liftoff, the music heard in the background is from "Dawn and Siegfried's Rhine Journey", an excerpt in Richard Wagner's "Götterdämmerung", the last movement in Der Ring des Nibelungen.
- In retrospect, Chuck Jones considered this one of his animated shorts which managed to "turn the corner" towards strange, new, and enchanting directions, because it was the first outer space-themed short.
- The cartoon's production code shows that this short was produced before "You Were Never Duckier", "The Pest That Came to Dinner", and "Hot Cross Bunny", both of which are in the post-1948 package instead of the a.a.p. package.
- "Haredevil Hare" at SuperCartoons.net
- "Haredevil Hare" at B99.TV
- "Haredevil Hare" on the SFX Resource Wiki