Dillmann says the Mary Jane reference is to the town where the brewery is located: Weed, California. In fact, Dillmann "scoffs" at the notion that people think he's talking about la Ganja. He's had the word "Weed" (again, the town, not the plant) on all of his beers for yeeeears. He isn't, as the federal regulators are trying to suggest, "[misleading] consumers about the characteristics of the alcoholic beverage."
Heh. Sure. Try some Weed. As the site says, "Weed. A flavor yet to be discovered." Really. We're still talking about beer, here.
Pic from Mt. Shasta Brewing Company.