Constable Crabtree describes rye whiskey as being "like bourbon, only good." Canadian rye whiskey, unlike American, does not require a minimum amount of rye to be called "rye whiskey." In fact, only a few select Canadian ryes are made with 100% rye mash.
In this episode the character Ian Kilmister is an owner of the factory where Whisky is made. In real life Ian Kilmister was the birth name of Lemmy who was the founder and vocalist of the band Motorhead and was famous for drinking a bottle of Jack Daniel's a day for decades.
Episode title is a play on "The Catcher in the Rye", the title of a controversial novel written by J.D. Salinger (1919-2010) and published in 1951.