Revealing mistake: David Carradine's stunt double is obvious (different face, darker hair) in the fight scene between Caine and Shelby Cross.
Kung Fu (1972)
1 revealing mistake in season 3 - chronological order
Starring: David Carradine, Keye Luke, Philip Ahn, Radames Pera
The Chalice - S2-E3
Factual error: After the opening credits, Caine is walking along the beach. On the beach behind him, you can see a modern long-board surfboard lying in the sand which gets caught up in a wave.
Trivia: "Kung Fu" was not canceled due to poor ratings, as it performed solidly during its run. It was canceled due to the physical stress and abuse on David Carradine's body, and it was wearing him out.