Lots of great minutia in this one! Heuvelman's Lake is in Millikan County, named after Rick Millikin, a casting director on the show (good job Rick Millikin). Heuvelman's Lake is named for a Dutch cryptozoologist named Van Heuvels, who wrote a book on sea serpents. Also of note, Mulder's speech about wishing he had a peg leg so he wouldn't have to work so hard comes from a 1970's pop psychology bible called Games People Play.

It's a kicky episode from the Kims (Newton and Manners, writing and directing, respectively) that was rumored to have some script doctoring from Darin Morgan, which is why there are references to Morgan's previous scripts War of the Copraphages and Clyde Bruckman (and forward into the miniseries with Dagoo, Queequeg's successor).

Open the case file below for the full investigation