The actor who plays Tom (the injured patient Sidney cures of hysterical paralysis) is the same actor who played a hysterical paralysis patient Hawkeye cures, with Sidney's help, in Mad Dogs and Servicemen (1974). Although in both instances the actor played a character who recovered from hysterical paralysis and was sent back to the front, he has a different name in this episode, meaning it's not the same character, just a similar one.
Peter Riegert plays Pvt. Igor Straminsky - who is usually played by Jeff Maxwell - in this episode.