Continuity mistake: Near the start of the show, Roz is reading the note Bulldog has left with the teddy bear. She is holding the note in both hands with the bear between her arm and chest. As she says "love, Bulldog", the shot shows one hand hugging the bear against her, with no time for this to have happened naturally.
Continuity mistake: When Niles and Daphne are on the roof having their picnic, Niles tries Daphne's peanut brittle but when she turns away he throws it off the roof, and lays the plate down on the blanket. When Daphne turns back and asks him what happened to the candy, we see him holding the plate again, even though he had no time to pick it up.
Continuity mistake: Frazier and Marty go into the kitchen. Frazier gets out a blue bottle of water, uncaps it, puts the cap on the counter - and in the next shot we see him do the same thing again. He then goes into the living room and mistakenly tells Daphne he is going to pay for her wedding. She hugs him, and he is still holding the bottle of water. The next shot of her hugging him shows nothing in his hands, and when she lets him go, he whirls around and grabs his bottle of water off the bookcase.
Continuity mistake: At the radio station, Roz waves her pencil at Frasier through the glass to wrap up his show; she has a KACL mug in her other hand. The next shot shows her actually leaning over to pick up the mug, without enough time for her to have put it down in the first place.
Continuity mistake: Frasier comes home to his apartment with a bottle of wine in a paper bag. He takes the bottle out and puts it on the table holding the bag in the other hand, but in the next shot we see the bag is already on the table and he is just placing the bottle down.
Continuity mistake: At the picnic, Bulldog puts his hand on the shoulder of a little girl in a dark pink dress, just before the pinata bashing starts; the next shot shows the same little girl is standing on the other side of the pinata, next to a woman in a blue and white striped top.
Continuity mistake: When Poppy is just about to start her show and is being emotional with everyone, Roz is standing at the door with a corded phone to her ear throughout the scene. She yells "Ten seconds." and the shot shows the phone, cord and all, has completely disappeared.
Continuity mistake: Marty and Niles are getting off the elevator and Marty transfers his mail into his left hand just as he goes to open the door to Frasier's apartment. When the shot changes to show them coming into the apartment, the mail is in Marty's right hand - there is no way he could have transferred the mail again in such a short time.