Dog Shelter - S5-E23
Factual error: Rocky the dog, who turns out to be Rocky IV, is a mixed breed. It would have been impossible for Doug's parents to find three more adult dogs who looked near identical.

Starring: Kevin James, Jerry Stiller, Leah Remini, Victor Williams
Genres: Comedy
Dog Shelter - S5-E23
Factual error: Rocky the dog, who turns out to be Rocky IV, is a mixed breed. It would have been impossible for Doug's parents to find three more adult dogs who looked near identical.
Revealing mistake: When Carrie phones Doug at IPS, Doug goes to press the button on the phone for the correct line, but doesn't press any and continues to talk to Carrie. (00:07:40)
Doug Heffernan: OK, I read somewhere that penguins are scared of walruses... So get down there and act like a walrus.
Deacon Palmer: OK so the two of us are up for the role of walrus, and I get it?
Trivia: Kevin James, who plays lead character Doug, and Gary Valentine, who plays his cousin Danny, are in fact real life brothers, with Gary being over 4 yrs older.
Question: Has Carrie's sister, Sara, ever been mentioned again after the first few episodes, and why was she taken off?
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.