According to Sir Roger Moore in his autobiography, the fake snow used in production was initially made with gypsum and cornflakes. However, it later included six inch nails and lumps of wood. The crew were allow to wear protective masks, but the actors were not. Moore said that the cast members had to go to the studio nurse at least twice a day to get their eyes flushed out from the dirt and grit.
Sir Roger Moore said that the Skagway streets were actually a backlot in Burbank, California. The cast were dressed in giant snow boots, fur boots, gloves, and parkas, yet the temperature was usually in the eighties.
The Screen Writers Guild went out on strike in January 1960, and did not settle with the major studios until June 1960. After Warner Brothers had gone through all existing scripts of this show, they began to re-work old scripts from their series Maverick (1957). Hardly more than character names were changed, which made the plot very predictable to "Maverick" fans. It is interesting to note that this show went off the air at the same time that the writers settled their strike.
Wheels were hidden underneath the sleds in order to make it easier for the dogs to pull them.
Dorothy Provine got a starring role opposite British actor Roger Moore. Although the ratings were disappointing, Warner Bros. was so impressed with her that they immediately cast her a starring role as "Pinky Pinkham" in their new series "The Roaring 20's" (1960). That role transformed her into a "name star".