The Night of the Camera - S4-E10
Revealing mistake: As Bosley Cranston fights the bad guy, Pat Paulsen's stunt double does not look like Paulsen - the stunt double is much younger looking.
The Night of the Camera - S4-E10
Continuity mistake: When West finds the half poker chip, he moves to place it in his left outside vest pocket with his left hand, but the next shot shows him placing the chip into the inside left pocket of the vest with his right hand.