Party Favor - S2-E13
Continuity mistake: At the beginning when Doug is putting his jacket on to go outside to scrape frost off the car, the lamp in the corner of the living room is off. In the next shot from outside the lamp is instantly on and when can see Carrie did not turn it on. (00:00:50)
Party Favor - S2-E13
Continuity mistake: At the start, Doug has a spatula in one hand and a whisk in the other. Camera does an instant cut and they have swapped hands. This is not to be confused with when he is messing about and you see him swap the items between hands. (00:00:50)
Party Favor - S2-E13
Continuity mistake: When Doug is mimicking the Japanese chef, the towel on the side moves positions without being touched. (00:01:00)
Party Favor - S2-E13
Continuity mistake: The colour of the card on which Doug the first draft of his speech changes from blue to white and back to blue. (00:09:00)
Party Favor - S2-E13
Continuity mistake: When Doug is reading his speech to Arthur, Arthur's legs are crossed or uncrossed depending on the angle. (00:09:30)
Answer: Sara hasn't been mentioned in later episodes, and it suggested in later episodes that she never existed, and that Carrie is an only child. Kevin James stated that the producers couldn't think of an good plots to use with Sara, so they left her out.