When Jeff says 'Nice sweater' to Andre he says 'My dad gave it to me'. The sweater he's wearing is in the same style of what Bill Cosby used to wear as Cliff Huxtable on The Cosby Show (1984). Malcolm-Jamal Warner, who plays Andre, is best known for his role as Theo Huxtable, the son of Cliff Huxtable on that show.
Second mention of Fat Neil, and first time we see him.
Rich says he carved the spoon from a tree branch that was struck by lightning in his backyard. This is a reference to the movie The Natural (1984) with Robert Redford, about a baseball player who uses a special bat carved from a tree which was struck by lightning.
When Jeff compliments Rich's apartment smell, Rich tells him baking muffin tops. This is a reference to The Muffin Tops (1997).