The network handed the creative reigns of the show over to Jack Webb and William Conrad for the show's 6th and final season. Webb and Conrad proceeded to fire the entire cast except Efrem Zimbalist Jr., and re-molded his character Stu Bailey into an international spy.
This series was produced by Warner Brothers for ABC and the episode "The Kookie Caper" (episode 2.2, October 9, 1959) has some inside jokes about other series produced by that studio for ABC. Early in episode, Kookie (Edd Byrnes indicates that he doesn't know that Will Hutchins is the star of Sugarfoot (1957). Later, he can be seen reading an issue of TV Guide magazine with the stars of Maverick (1957), James Garner and Jack Kelly, on the cover. Both of those shows were produced by Warner Bros., as was this one.