- He was a teacher at Emerson College in Boston, Massachusetts.
- He composed his Boomtown theme song on the day he was hired to do the show.
- His horses name was "Goldrush".
- On "Boomtown" Rex demonstrated the crafts he had learned on his grandfather's ranch, including shooting. This ended with the assassination of John F. Kennedy in 1963, and Rex no longer permitted weapons on the set.
- His song, "Hoofbeats", recorded in 1950 was used to bridge the scene between the bunkhouse and Boomtown.
- Since his show was covering a western town, he got the idea of its title from the Clark Gable movie "Boom Town" (1940).
- His first sidekick on "Boomtown" was Pablo, played by Richard Kilbride. He remained on the show until 1967, when he passed away. He was replaced by Cactus Pete, played by Terrance Currier, and then Sergeant Billy, played by Bill O'Brien. Sergeant Billy still performs with Rex today.
- Always arrived on the set of Boomtown on horseback.
- He died of pneumonia at the age of 84 years old.
- He was an advocate for public safety, gun safety, and animal rights.
- For many years he was the National Carnival Chairman for Muscular Dystrophy and used television to educate his audiences about the disease.
- Teaching at Emerson College in Boston (1999)
- He got his start in television in 1947 taking whatever job he could get at the Dumont Network.
- While in New York, Rex became good friends with Gabby Hayes. Was such an accomplished rodeo rider, that Gabby hired him to work at his summer ranch.
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