In the second to last window (?) of this episode there is a text in the back.
According to the OotS-Forum* it says:
Blizzard’s Ristorante
I’ve never played WoW beyond level 10 so I have to seek you guidence, what does that mean?
In other news, Belkar totally rocks again 
*I couldn’t figure it out myself and they’re no help beyond that
It’s a combined spoof of The Godfather (and Italian mob stereotypes in general) and World of Warcraft.
Ah, cock. And here I thought it was something more than that.
Thanks!
I thought it was a reference to this, or maybe this.
I’ll admit I was initially confused by the reference to “The MOBs”. I had never heard that gaming term before and had to look it up.
One further question: the scribbled lines on the legal pad that Hank’s holding in Panel 9 seem to be on the edge of forming legible words. (The lower left corner, for example, looks like the word Kiss.) Is this just my imagination or can someone decipher it?