Audio problem: While all four guys are on the bed watching the game, Richie's eating a sub so we hear Doug say, "Hey, Richie, come on," but Doug's lips are closed and not moving in this shot. (00:15:10)
Road Rayge - S1-E9
Audio problem: Doug gets his license back and gets into his car. We hear the engine start, but his hands are seen on screen at the time. (00:20:00)
Head First - S1-E6
Audio problem: Doug calls Arthur near the start and the audio is overdubbed. (00:03:15)
Audio problem: When Doug goes to the door to call for Uncle Hank, the audio is over dubbed. (00:04:05)
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.