I only remember one part:
When the Gleeks are having lunch Kurt is sitting next to Puck and is trying to find out something from Mercedes when Puck starts telling him to eat, and that Kurt hasn't been eating much of anything lately. Kurt is upset, because it really wasn't intentional. He just didn't realize how little he has been eating. Then Mercedes starts telling him what Kurt wanted to know while Puck keeps prompting Kurt to keep eating.