In the film, Egg Shen arms himself for the climactic battle with Lo Pan with what he refers to as a Six-Demon Bag. When Jack asks what it contains, Egg Shen answers, "Wind, fire, all that kind of thing." In the online computer game World of Warcraft, a Six-Demon Bag appears as a rare item whose powers are described with a phrase using those words in its description. Similarly: in the film, Eddie Lee explains to Jack that "the Chinese have many Hells". Later, Jack and Wang Chi find themselves trapped in the Hell of Upside-Down Sinners - an underwater area with upside-down chained corpses. In World of Warcraft, there is an area in Deadwind Pass with an unopened dungeon in it. When viewed in an external map viewer, one can see an area of this dungeon called "The-Upside Down Sinners" containing such corpses.
I don't know exactly how developers would pull it off but I'd be all about a Big Trouble In Little China MMP.