Although this episode first aired during Season 3, it (along with "The Mugging") was originally filmed during Season 1. These two episodes do not appear on the Season 3 DVD set, but both can be found as "bonus episodes" on the Season 1 DVD set.
Note the front door at Brian's apartment; it's from the set of the Golden Girls. Look closely for the indentation near the actor's eye level that resembles an explanation point. Also, it has the same door knob as when it was part of the Golden Girls' set.