Charles Dugan, who plays the elderly Harry, previously appeared in the season 2 episode "High Anxiety" (1990), where his character, Mr. Stubbs, was a visually-impaired senior citizen applying to be a pilot for Sandpiper. Between acting choices, wardrobe, and the fact that Nantucket is a small island with a low population, it's safe to assume that in this episode he is the same character he played before, which would make his full name Mr. Harry Stubbs.