I don't anyone's noticed this discrepancy before, John. "Neptune's Raging Fury" is the original title of the well-known and long popular "Ye Gentleman of England." "Cheer Up, Sam, Don't Let your Spirits Go Down!" was a 19th C. hit.

My guess is that Hugill simply misremembered what he'd read, or, perhaps more likely, a correspondent misinformed him and Hugill never checked the information.