In the scene where Doug brings a bottle of liquor to his boss there is a grease board with names of drivers listed. The fifth name down is Knipfing which is Kevin James, Dougs, birth name.
In the scene where Carrie walks into the kitchen and asked Doug what's going on he replied "Just using two packets of icing on one toaster strudel..." However The box on the table are Pop Tarts pastry swirls.