John Lithgow's character (Mark Lambert) was a Navy SEAL during his service in Vietnam.
There it is.
Jack Lambert: Fuck "There it is"! Don't you see I care about you?
The 1966 Pontiac used in the film is not a real GTO. The taillights are single pod lenses making this either a Tempest or LeMans - a real GTO has segmented taillights which spans the rear header panel with a 12 inch blank center section. Also, a real GTO has the grille emblem in the driver side grille opening (same with the final 2004-06 generation) - the emblem is on the passenger side grille (the final muscle-era GTO produced for the 1974 model year has a vinyl graphic GTO logo placed on the passenger-side header panel).
$82,186 13 November 1988