Trivia: When Spence is describing why he can't eat peanuts ("My body doesn't like this and my throat gets real small") Kirby's hands are mimicking the lines along with Spence because he already knows what Spence is going to say. (00:51:40)
Trivia: The picture that Doug brings to the high school reunion is a picture of Leah Remini from the magazine Stuff in real life. You can see it when Doug shows the picture to his friend at the reunion. Carrie Heffernan is hot, but was probably not on the cover of Stuff magazine.
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.