I loved that old picture of Stanley from way back when, but I also loved the little touches about Stanley trying to lose weight, like when he was doing leg lifts under his desk with paper on them. I also love Phyllis, and how she got control of the party-planning committee. Kelly's diets cracked me up, especially the master cleanse diet because one of my best friends actually tried that one (and lasted all of two days). For some reason, Dwight replacing the contents of the vending machine with fruit cracked me up.
In one of the deleted scenes, there's a great scene with Oscar talking about the weight loss competition.