The episode is great with lots of laughs, but Carrie's insecurity turns her into an unreasonable hateful demon. It's natural to be jealous because her husband is enjoying the wonderfully cooked meals of another woman, (she's in cooking school and he tests her meals) but Carrie takes it so personally that she lashes out at the unsuspecting poor woman when she comes for a visit.
It's funny though when Carrie says if she sees any more food from that woman in the house she'll kill them both and Doug is like "What are you gonna do? Whip one of your biscuits at my head"? LOL.
I do admit that Carrie is funny when she lashes out the way she does, but she's also slightly psychotic in the way she treated the woman and Doug. You can't help but wonder why someone as easy going and nice as Doug is doing with such an ill tempered, bitter woman like Carrie.