In episode 1, Doug is wearing a bearalope (from Graham Annable's Dank the Comic Creator webcomic) t-shirt. Doug is based on Doug Tabacco, former Telltale employee and former Mojo staffer. Also notice the subtle reference to an "easter egg hunt" (looking for hidden jokes) on the sign in the background. One of the signs also says "The IT Guy", referring to the fact that Doug was Telltale's IT (information technology) guy.
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