Frasier is in the kitchen after dinner getting dessert ready. In the first scene, the pastries he places on the counter are not powdered with sugar. In the next scene he starts powdering them, but they are already heavily powdered, despite Frasier only sprinkling on powdered sugar for a couple of seconds.
Frasier talks loudly to about Diane even though it has been established people can hear.
When Fraiser comes back to the stage of Diane's play, as they're talking, when the camera is on Diane, you can see a crew member over her shoulder. In one shot he's there, then in another he's gone. Then in another he's back.
Frasier (Kelsey Grammer) refers to the olive he offers Diane (Shelley Long) as "A Pyranean taste treat, hand-picked and bottled by Andalusian monks." The Pyranean Mountains are in the north-eastern corner of the country, along the French border, while Andalusia is a region on the south coast, several hundred miles away.