Continuity mistake: When Niles is drunk in Frasier's appartment, he puts a six-pack of beer cans on the table by Martin's chair. The pack has changed position on the table later on when Frasier is talking about empowerment, without anyone touching it. (00:09:15 - 00:10:35)David Mercier
Continuity mistake: Early in the show, Frasier is at home - the rest of the gang have surprised him with a birthday cake. In one shot the candles are burning on the cake, in the next Frasier is cutting the cake and the candles have disappeared, with no time allowed to remove them.
Continuity mistake: Roz is talking to Frasier, Gil, and Bulldog at KACL and has her hands in front of her, with her mug in her left hand. In the next shot, as she says "everyone at her last station was scared to death of her", her mug is in her hand tucked up under her arm - with no time for her to change positions naturally.
Continuity mistake: Niles is filming is father in his recliner, trying to record his life story for posterity. Marty fakes a heart attack or death - and lies back in his chair with his left arm by his side. In the next shot his arm is crooked up around his head, but with no time for him to have moved it.
Continuity mistake: Martin and Daphne are laughing at Eddie who has taken a pill to calm him down - in one shot he has a paw up in the air, but in the next shot both paws are pointing sideways. The shot changes again, and Eddie is back in the first position. He had to time to change naturally.