There are also some minor inconsistencies which are each very forgivable but all together contribute to the disconnect I feel towards this movie: it's clearly set in the 80s but the characters are supposed to have a past rooted in the 60s counterculture, and yet they seem so relatively young. And yet they have turned that page pretty swiftly, and made it big, while continuing from time to time to utter oddly naive considerations. There's a lot of music in the film, diegetic and not. Sometimes we get whole songs while the characters do stuff in the background, and it seems a bit of a narrative copt-out.
For the positives: it's very well acted and contains several genuinely funny moments. But I struggle to see what's supposed to be "seminal" about it. There's another film on a very similar theme, "Le déclin de l'empire americain" -- which feels infinitely more real and poignant than this one.