During Duncan's fight with Kalas at the end, it goes from early sunset to pitch dark awfully fast.
1920 Paris, 1658 Europe
Kalas: Nothing changes, MacLeod. Ever.
MacLeod: Then come and die.
Duncan: Hey, Joe. What's up?
Joe: You've got trouble.
Duncan: How come you never call me with good news?
Maria: You two know each other?
Kalas: Duncan MacLeod knows everybody.
Methos: Live, Highlander. Grow stronger. Fight another day.
Joe: Imagine an Immortal so old he doesn't remember the time of his birth.
Duncan: I just didn't think you existed.
Methos: Well, it's good to be a myth.
Duncan: Yeah, no one hunts for a myth. Or a Watcher.
Methos: What better place to hide? I'm in charge of finding myself and I make sure it never happens. Even got a few entries on you in my journal.
Duncan: You keep a diary?
Methos: I've been keeping it almost since writing began.
Duncan: That would make a hell of a read.
Methos: You could say that. How may people have stood on the same stage with Julius Caesar and the Rolling Stones?
Duncan: When was the last time you faced anyone?
Methos: Ooh, uh. What are we? (checks his watch) Sixth of March. Uhh...two hundred years.
Duncan: Oh, that's good.
Methos: I may be a bit rusty, but I'm still here.
Duncan: Well, let's keep it that way.
Methos: Duncan MacLeod of the Clan MacLeod. Have a beer. Mi casa es su casa.
Methos/Adam Pierson was written to be only a one-shot character for this episode. Massive viewer popularity for the character convinced the producers to add him to more episodes.
This episode is considered #5 in the top thirteen Highlander shows by the production crew.
According to the show's Swordmaster, F. Braun McAsh, the flashy, gliding, sliding sword fight between MacLeod and Kalas was half design/half accident. The night before shooting in a historic French chateau a caretaker had waxed the ballroom floor, making the set a graceful yet dangerous location for the duel. McAsh re-choreographed the fight somewhat to assist the actors' safety and to keep from damaging the ballroom's 250-year-old crystal chandeliers with blade swings.
Shakespeare and Company--the Watcher safehouse where Don Salzer meets an untimely end at Kalas' hands--is an actual (and quite famous) working bookstore. It has branches in Paris, Berkeley, Rome, Vienna, New York, Seattle, Bogota, and Moscow. The Seattle branch stands in for the Seacouver Watcher Regional HQ.
Maria: You know Picasso?
Pablo Picasso (1881-1973)--arguably the most famous of Modern artists--was the co-founder of the Cubist Movement in Modern Art. He was involved in Surrealism in Paris during the 1920's.
The book Duncan carries around with him is Sartre's Being and Nothingness. Jean-Paul Sartre (1905-1980) was the well-known and regarded writer, philosopher, and leading thinker on Existentialism.