As Doug is standing at the door to leave the abused men's support group, he has two glazed donuts and one chocolate donut on his plate. In the next shot, he has two chocolate donuts and one glazed one.
Sitting in the movie theatre Doug finishes the box of Milk Duds and leaves the rice cakes behind. Inthe next scene he is showing a rice cake sandwich with Milk Duds filling.
Doug is eating a bucket of chicken from Chick-Fil-A. There are no Chick-Fil-A stores near Queens.
When Carrie is driving Doug to his first weight watchers meeting you can see an intersection sign that says Hollywood Way Airport with an arrow. That street is in Burbank, CA, when it's supposed to be in Queens, NY.