To answer the question from the last WIP post: it was the chips. In fact throughout the next WIP pages you'll notice the number of chips every character has is something I'll be very consistent about.
One thing I changed when doing the lineart is Walter's expression on the last panel. Even though Walter's 100% down for this sort of thing, I imagine he'd look a bit surprised at the realisation that he's going to be passed around as an object and that's what the original expression reflects, but I wanted there to be no shadow of a doubt that he's fully consenting and happy to do this. So in the final version of the comic, he looks more eager.
I was going to make the "hahaha" in the middle panel shift through all the professors' respective speech bubble colors (red, blue, purple) but it looked goofy, I stuck with white.