If you encounter any more sightings, please let me know! I'm also interested in expanding these listings with further juicy gossip, tidbits, trivia, scandal, or whatever else that will make these movies more enticing. Thanks!
In the Seinfeld episode where George + Jerry take a limo intended for a neo-nazi party leader there is a spit second shot of a passing New Yorker coupe (76-78). It's in a scene where Elaine and Kramer are waiting on a corner for Jerry and George to arrive. You really have to pay attention as it goes by rather quick. (Perhaps this is a bit excessive?)