(completely random) but how about adding some sort of reference to Dr. Ivan? maybe a locker with his name or something…
No easter eggs… suggesting them, anyway. Then they’re not surprises.
Who the hell is Dr. Ivan?
Um, Dr. Niblick Ivan?
Doesn’t ring a bell. Google, here I come!
EDIT: Nothing came up…
That poster was, presumably, talking about “Ivan the Space-Biker”. 
AKA Beta Gordon.
Oh, that Ivan.
This is a really tiny detail, but have the sound of a coin going down the vending machine when you get a soda.
I think that is the best suggestion I have heard in a LONG LONG LONG time!
And when it runs out of sodas, have the sound of a coin falling through.
Or alternate it with the sound of a bill going through the bill slot.
It is America, after all. Home of the paper dollar.
America’s money isn’t made of paper. 
It isn’t?
No, it’s made from the blood and sweat of our finest workers.
American “paper” money is printed on fabric.
It’s 75% cotton and 25% linen.
America: Home of the hella expensive sodas that require non-paper money ;/
Fools! When will you learn that plastic is the way of the future?
There’s a Kleiner style scientist also in the break room at the time of Gordon destroying the casserole. Maybe it was The Mag and he was too busy molesting the soda machine to notice?