Corrected entry: The time of year changes throughout the action. When Parker Posey is grilling chicken outside her house, she's wearing a coat and the trees are bare. But in the scene on the courthouse lawn a few minutes later, the singers are all wearing T-shirts. And at the end of the movie, we learn that Mort Guffman's flight couldn't leave New York because of a snowstorm there.
Corrected entry: At The Chinese dinner, the plate of beef disappears then reappears.