Ron Perlman and John Rhys-Davies were considered for the role of Methos. Perlman ended up guest starring in the fifth season episode of the series Highlander: The Messenger (1996) playing an Immortal pretending to be Methos (played by Peter Wingfield.)
Smooth. Very, very smooth. I'm takin' notes.
Episode 1.20, "Avenging Angel", features a swordfight between immortals that appears to be on holy ground; however the site is actually a museum displaying religious artifacts from the crusades. The confusion arises because footage from this fight is seen in the opening credits of later episodes as the narrator speaks of holy ground.
The short American versions of episodes 1.1 (The Gathering") and 1.8 ("Revenge is Sweet") were combined (run back-to-back with only one set of opening and closing credits) into an ersatz feature film for direct-to-video release, "Highlander: The Gathering."