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The character of Laura, although played by a different actress, is the same one who appeared in the episode Monday is Forever. In that episode, Laura is moving to Detroit, but in this episode it's Chicago.
At 46:05 you can noticeably see a large housefly land on the left lapel of Doug's jacket, at the right of the screen. It moves around for a second or two than flies off.
At one point Nancy tells Doug that she's having "another baby". Over the course of the series, Nancy and Jeff have only one baby, Timmy. No mention is ever made of another baby.