'Gold Country' originally aired as a two hour episode. In syndication it's split into two parts, and both parts use the identical opening theme and actor credits. So part 1 ends up guest crediting actor
Brian Libby (Jake) even though he doesn't appear in part 1, and part 2 guest credits actors
Richard Bull (Nels) and
Dick Armstrong (Grady) even though they don't appear in part 2. At the beginning of part 2, the credits for producers, writers and director is omitted after the opening theme, leaving them uncredited.