Despite his tough-guy image when playing Ken Boon, Michael Elphick was scared of riding Boon's motorcycle. "I find bikes much too dangerous. It's Boon who rides them, not me. I don't drive a car either, for the same reason, really."
Box 13 - the address in Boon's advert in series 1 - was a radio series that ran for 52 episodes in 1948-49 with a similar premise. Alan Ladd played a writer who was desperate for ideas for his fiction projects. He ran a want ad that read: "Adventure wanted. Will go anywhere, do anything. Reply to Box 13."
Jim Diamond originally wrote the title song, "Hi Ho Silver", as a tribute to his father who had recently died, and who, like Ken Boon and Harry Crawford, had been a fireman.
According to Jim Hill (co-creator), the name "Boon" was derived as follows: "Originally called 'Anything Legal Considered', we fell foul of the vogue of the main character's name being all or part of the title. Boon had been derived from an American television series from the 1950s, that William Stair and I both watched and liked. It was called Have Gun - Will Travel (1957), a troubleshooting cowboy answered distress calls. He was called Paladin, and was played by Richard Boone. We dropped the "e" and we had "Boon", a modern-day trouble shooter on a motorbike, instead of a steed."
David Daker is said to have hated the series.