Continuity mistake: In 1-9 "Road Rayge", Doug and Carrie are sitting watching TV and a song comes on. She tells Doug it is their song, because in junior high he asked her to dance and she said no and gave him the finger. However in this episode we see they first met at a bar and Carrie went home with Richie.
Character mistake: The woman in the store claims that the umlaut on the shoe size indicates a half size in Europe. This is wrong because the European shoe size system (used in Germany among others) is completely different from the US system. Carrie's 6 1/2 shoes would be a size 39 according to the European system.