The very first time you see Rebecca she has a weight problem, and then you don't see her again, until she wants to be artifical i.. What happened to her weight problem? And her modeling career?

That's one inconsistency that really bugged me.
The episodes where she wanted to have a baby, had the baby, and brought the baby around to the house, she was the complete opposite of the Becky we met in the first season. The two actresses looked nothing alike!!! At least they had the same actress for all the baby episodes.