On December 24th, the tear-off calendar on the Christmas Shop counter reads "one days till Christmas" when it should say "one day 'till Christmas."
The movie takes place in NYC just before Christmas. However, the only time you see winter (bare deciduous trees, and snow) is in the overused NYC stock footage to mask that movie was shot in autumn. The outdoor city scenes are full of yellowish deciduous trees and green bushes, and production added a bit of artificial snow on the side walks.