Emily's fear of flying, which was introduced in the 1st episode in the series, is mentioned again in this episode. [The pilot episode, "P-I-L-O-T", was not the 1st episode of the series, where one would expect it to be, but placed in as episode 10 for some reason.]
Four episodes earlier ('Don't Go To Bed, Mad'), the Hartleys had an unresolved argument about whether Bob will be allowed to watch Monday Night Football. Apparently the argument was resolved in Bob's favor, because in this episode, he complains about missing Monday Night Football.
Bob, Emily, and Howard all live in the same building, in the Edgewater neighborhood of Chicago, off Sheridan Road. In Bob's downtown Chicago office, Emily tells Howard he cannot walk home because that's almost 20 miles. In reality, the distance is less than eight miles.