In the previous episode, "The Money Machine," the roommates get a new couch. However, the old, usual couch is back in this episode. But, in the next episode, "Alias Jack Tripper," the new couch is back and remains for the rest of the series.
Approximately halfway through the episode, when Jack leaves Terri to distract the secretary, he exits the room and turns left. If you keep watching him, you can see Jack hunch down, inexplicably, then you can see him sneak though the, supposedly, second or third storey tree and shrubs. When Jack is next seen, he is climbing up said tree and the "buildings" in the background look to be at least two storeys high.