Farkle is pretty much like Yahtzee.
Kenny connects to the internet with a computer provided through the One Laptop per Child program.
Kip Drordy (South Park Studios put this up) - if you've seen Mask (yes, an '80s film), you may notice his resemblance to Rocky Dennis (I knew him IRL, but not very well).
Kip's birthdate is July 17, 2003. That makes him six years old now, a first-grader, not a third-grader as Cartman states.
The friend confirmation windows get all mixed up. The second popup says "Confirm Kyle as your friend?", but it disappears when Kip goes to add Kyle. The first window then has the second window merged into it, and the question now reads "Accept Kyle as your friend?"
Kyle might be annoyed at Cartman's podcast, but his screen says he likes it. :)
Clyde is back to Donovan as his last name.
Kip's home life suggests The Brady Bunch. The kitchen looks a bit like the Brady kitchen, and he had pork chops and apple sauce for dinner.
"Uhhh, I'm gonna count five in my five box." - the dice on the table are three 3s, a 1, and a 4. There is no 5 he should be writing on his game pad.
Stan is using a 386 computer - a beige box straight out of the '90s - but he has the latest in monitors.
We finally get an official spelling for Jimmy's last name: Valmer. People have used this spelling before, as well as Valmor (me, for one), Vulmer, and Vulmor, but Valmer it is. :)