Tuvok reveals the time and place of his birth in this episode: "Stardate 38774, Vulcanis Lunar colony," making him 113 years old; however, in Fury (2000) Janeway specifically stated in reference to Tuvok's age that it was "Not long until you hit the big three digits." Janeway may have been referring to his age in Vulcan years (which would have been 95 at the time). Edit: Encounter at Farpoint (1987) takes place on stardate 41153. Stardate 38774 means that Tuvok would have been born 3 years before this and would only be 16 years old in this episode.
Susanna Thompson has played four characters in the Star Trek franchise - the Borg Queen in Dark Frontier (1999), Unimatrix Zero (2000), Unimatrix Zero Part II (2000), Dr. Lenara Kahn in Rejoined (1995), Varel on The Next Phase (1992), and Jaya on Frame of Mind (1993).
The implant on General Koroks left ear is the same implant as what Seven of Nine had before her implants were removed by the Doctor. The only difference is this implant on Koroks head is on his left side when Sevens was on her right. So if you flip the piece to the right side you will see it matches exactly.
Mark Deakins (Axum) also played Tournel in Star Trek: Insurrection (1998), and Turanj, a Hirogen hunter, in The Killing Game (1998).