Ok here's a big slipup about Doug and carries wedding.

In the episode "fat city" carries is depressed because

Doug told her to go on a diet. In one scene

Carrie is sitting on the couch eating and she is wearing a white satin halter style dress that's puffy at the bottom, she mentions its her wedding dress. Here's the slip up

In a later episode called "Veiled Threat"

When Carrie is rembering her wedding day

In this episode you can clearly see her wedding dress

Is a white beaded strapless dress that is straight at the bottom unlike the other dress which was puffy at the bottom.

a completely different dress from the previous episode

"Fat city ". Also in many episode you can see

A picture of Doug and carries wedding

And Carrie is seen wearing the white strapless dress from the episode "Veiled Threat".