When Daphne enters her room to find Frasier in her bed, he pops the cork on a champagne bottle and the liquid flows out onto his blanket. In the next shot--after Frasier has wrapped himself in said blanket--no trace of the liquid can be seen on the blanket.
Frasier mentions to Roz that he hopes she can endure the 4 hour drive to Mt. Baker. But driving from Seattle to Mt. Baker only takes 2 1/2 hours at the most.
About her ski weekend, Roz says, "This is the first thing I have ever won in my entire life." Evidently, she's forgotten having won a SeaBee in Someone to Watch Over Me (1995).