Starring: Robert Conrad, Dick Cangey, Ross Martin, Whitey Hughes
The Night of the Golden Cobra - S2-E2
Continuity mistake: At the beginning of the closing scene, their private train is shown moving right next to tall green trees with large mountains directly behind the trees. The final shot of the scene shows the train in a very desert-like location moving towards the trees and mountains which are shown in the far distance.
The Night Dr. Loveless Died - S3-E4
Continuity mistake: In the opening scene, a cowboy sitting atop the balcony above Big Brad's Bar gets up and approaches the balcony's edge twice.
The Night Dr. Loveless Died - S3-E4
Trivia: Dr. Loveless' uncle's name, "Liebknicht", is, aside from the addition of the letter "k", German for "Loveless".