Could it be because Goodwin's first two-bar phrase is a kind of melodic mirror-image of Das Lied der Deutsche, the German national anthem ("Deutschland, Deutschland uber ...." etc)?
Nope, not getting that. Goodwin's theme starts on the upbeat then climbs the tonic arpeggio. Haydn's starts on the first beat and meanders in step around the first four degrees of the scale. Besides,
Deutschland Lied is on a melody from a not-particularly-Teutonic-sounding classical string quartet movement.