When the girl and Mr Perfect run into each other in the Christmas tree lot they land in snow. The next shot of them they're not laying in snow.
The tongs Alex uses when he is filling boxes with desserts/bread changes from blue to pink to blue.
During the gingerbread race, there are several inconsistencies with the icing such as icing being present before it's been applied, icing missing after it's been applied and residue from icing that had been removed after a previous take.