MK (Tatiana Maslany) wearing the sheep mask is a reference to Dolly the sheep cloned in Edinburgh, Scotland in 1996.
The strategy games that "Hell Wizard" was holding in the store are: "Puerto Rico" by Andreas Seyfarth, "Dominion" by Donald X. Vaccarino, "Mansions of Madness" by Corey Konieczka, and "Among the Stars" by Vangelis Bagiartakis.
The Rabbit Hole Comics name is a reference to Alice's Adventures in Wonderland by Lewis Carroll wherein Alice falls down the rabbit hole while chasing White Rabbit. This is the beginning of Alice's adventures and similarly Sarah Manning (Tatiana Maslany) fell down the rabbit hole into a new world when she encountered Beth Childs.