Goodnight, Seattle (2) - S11-E24
Trivia: Niles and Daphne's baby, David, was named in memory of show producer David Angell, who was killed in a plane during the September 11th attacks.
Goodnight, Seattle: Part 2 - S11-E24
Trivia: In the pilot episode, 'The Good Son', there is a fight brewing between Martin and Frasier because Frasier wants to hear Martin actually say the words, "Thank you" to him, for accepting his father into his apartment to care for him. In the series finale, 'Goodnight, Seattle (pt 2)', when Martin hugs Frasier, Martin says, "Thank you, Frasier," to his good son.
Goodnight, Seattle (2) - S11-E24
Trivia: Despite the episode's visual joke about Bebe's plastic surgeon, at the time of writing the actress is only 49 - the same age as Kelsey Grammer.
Answer: It equals the record of James Arness of "Gunsmoke" for the actor who's played the same part on TV NOT in a soap opera. If you include soaps there are two main contenders - William Roache, who's been playing Ken Barlow in "Coronation Street" in the UK since 1960. Don Hastings has been playing Robert Hughes in US soap "As the World Turns" since 1960 as well.