David Carradine (Kwai Chang Caine) and Chris Potter (Peter Caine) are the only actors to appear in every episode of the series.
When Peter asks Lasher to allow him to try and end the hostage taking, he recalls the events from ' Bankers Hours '.
Quirk apparently was a mercenary in the past and knows Kermit quite well.
Blake reveals to Skalany that he was a married to a school teacher in the past and that she was killed when she was caught in a shootout in a school corridor between rival gangs. This, coupled with her love for Christmas, led to Blake's grumpy and withdrawn mood on the holiday.
It is finally confirmed in this episode, by the Ancient, that he is Ping Hai, the kung-fu master and friend of Caine seen in Caine's temple in flashbacks throughout the series.
When saying his goodbyes at the precinct, one of the people Peter speaks to is referred to as ' Jon ', who was played by Jon Cassar. Jon directed this episode as well as several others in the series.
When told by The Ancient that he must become a Shaolin priest to help his father win his upcoming battle, Peter replies that he has already turned that down. This is a reference to the events depicted in ' Destiny '.
When Wong encounters the evil Caine in the pool hall, he refers to the events in ' Who is Kwai Chang Caine? ' as a reason not to trust him.
When Heather sees her mother's driver license info on Kermit's computer screen, it shows the town/city of residence as ' Chinatown, USA '.
Images Caine saw on the Bardo bar's TV were scenes from the following episodes (in order):
- ' Sunday in the Museum with George '
- ' The Return of the Shadow Assassin '
- ' Illusion '
- ' Brotherhood of the Bell '
- ' Warlord '
- ' Challenge '
- ' May I Ride With You? '
- ' Force of Habit '
- ' Dragon's Eye '
- ' Cruise Missiles '
- ' Laurie's Friend '
- ' Quake! '
- ' Plague '
Peter and the Ancient, with help from Skalany, journey to the Bardo, a dimension between life and death first seen in the Season 2 episode "The Bardo".
Skalany mentions at the beginning of the episode that Caine was struck by a speeding car when they last walked together in the downtown. This is a reference to the events depicted in ' Who is Kwai Chang Caine? '.
Kermit reminds Marilyn that he got the demons exorcised from her home, events that were seen in the Season 3 episode, 'Demons'.
It is revealed that Kermit had a younger brother named David, who was an undercover cop and died from a drug overdose, supposedly staged by Larsen.
Cindy Belmont reveals, at the end of the episode, that Rykker, who was in 'Dragonswing' and 'Dragonswing II', is her father.
When Khan first meets Peter in this episode, he mentions that they had last met in 'Dragonswing'. Khan's appearances since that episode are flashbacks to the time that Peter and his father were at the temple.
At one point, TJ mentions that he can recognize Caine's piano playing style from the time he heard him play, previously (in the episode, 'Prism').
Kermit, Straker and Blaisdell apparently worked together as mercenaries in the past.
Although not confirmed, it is implied that Kermit has a son (played by Jim Helfman) who is a major in the US Air Force.
When Freize and Caine first meet, there is a brief flashback to the "Gunfighters" episode.