These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: American Graffiti
Dawson Casting: The only exception is for Mackenzie Phillips, who was 12 at the time of filming and played a 13 year old girl.
Magnum Opus: George Lucasthought this award-winner would be his. After this movie's success gave him official cred as a real movie producer, Star Wars was a fun "throw-away" project nobody (including him) expected to have more than a niche audience. The narration in original trailer for A New Hope called Lucas "the man who brought to you American Graffiti".
Seinfeld Is Unfunny: Fifties nostalgia, now old hat, was still a pretty novel subject for a film in 1973.
Sequelitis: The original American Graffiti is regarded as a classic and one of George Lucas's best movies outside of the Star Wars franchise. More American Graffiti? Not so much.
Tear Jerker: Finding out the fates of John Milner and Terry the Toad (unless you've seen the sequel) in the epilogue.