Not sure if this has been found already or not, but I noticed a little Easter Egg in the Paul's Pizza Party card. The name of the pizza company on the pizza box is "Garozzo". I think this is a tribute to Salvatore (Volcano) Garozzo, a retired pro Counter Strike player who now works for Riot as a lead game designer.

https://liquipedia.net/counterstrike/Volcano

https://twitter.com/salgarozzo