During the trial of the actor who is accused of double murder, Grissom testifies that the scar which proves the actor committed the murders, is on his left knee. But in a blow-up picture which Grissom shows to the court, the scar is seen on the actor's right knee.
The character credited as "Ray-Ray Varney" is called "Raymond Lester" by Brass at the beginning of the episode, and "Ray" during the rest of the episode.