It's All Done with Mirrors - S1-E27
Revealing mistake: During Scott and Kelly's scuffle in the restaurant, the stunt men's faces are visible several times. (00:27:25)
Revealing mistake: In the final chase scene, the substitution of a stunt double is noticeable when Malachi Throne's character suddenly acquires considerably more hair. (00:40:10)
Rome ... Take Away Three - S2-E16
Revealing mistake: Kelly finds Tilde dead on her couch. But when he touches her, the "dead" woman's eyelids twitch. (00:37:05)
Revealing mistake: At the very end before the credits, Cosby and Culp play stickball with kids on the street. Cosby races to reach a fire hydrant which he almost knocks over, revealing it to be a prop. (00:51:00)
Revealing mistake: During his scuffle with the intruder, Kelly's stunt double's face is visible in several shots. (00:06:40)
Carmelita Is One of Us - S3-E25
Revealing mistake: When Scott picks up the baby and carries it out the door, the face of the plastic doll doubling for the real infant is visible. (00:41:30)