Executive Meddling: The show was to be cancelled after the 1966-67 season due to declining ratings, but it was the favorite of Barbara Mortimer, who just so happened to be married to William S. Paley, chairman of CBS; it was renewed at the last minute. To make place for it in the schedule, Gilligan's Islandgot the axe. Another attempt to cancel it was made after the 1970-71 season as part of The Rural Purge, but the decision was reversed due to Barbara's favoritism and the show's still-excellent Nielsen ratings (#5 in 1970-71; it went up to #4 in 1971-72); this time, Mayberry R.F.D. and Family Affair took the bullet instead.
Hey, It's That Place!: The gunfight between Matt Dillon and an unknown gunman that opened every episode was shot on the same main street as that used in High Noon.
The Other Darrin: Various secondary characters were played by whoever was handy at the time- bank manager Mr. Botkin has at least three actors, sometimes rotating. The desk clerk at the Dodge House also rotated (occasionally with one of the men who played Mr. Botkin).
What Could Have Been: Ken Curtis was offered a chance to be in the TV movie sequels, but declined to reprise his role as Festus, feeling that Miss Kitty should be in the spotlight with Matt instead. If he HAD taken the job, it'd would've been Festus serving as Dodge's marshal rather than Newly.
You Look Familiar: Over the 20 season run, a few actors came back to play other characters.