Revealing mistake: In the scene where Frasier and Lilith meet in the living room, where Frederick has created a romantic atmosphere, Frasier has a long speech about how Lilith is not going to get him back, ending with "I need to be finessed!" and Bebe Neuwirth goes out of character and begins to giggle, before she quickly covers her mouth and pulls herself together. Though Lilith might have found Frasier's comment amusing, it would definitely not be in character for her to giggle like that.
Continuity mistake: Lilith takes on the job of pouring wine for Thanksgiving dinner - we see her pour 2 glasses but when the shot changes there are 3 full glasses of wine on the table even though there had been none before she started.
Continuity mistake: Near the beginning of the show, Daphne comes home from shopping holding a bag of groceries with the leafy tops of vegetables facing out. Frederick goes to help her and suddenly the leafy tops are facing inwards, without Daphne having time to move the bag.
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.