Timeline 'liberties' were distracting
As someone who grew up in the 1960s/70s and had Frankie Valli and the Four Seasons songs coming out almost every year since I was a toddler, it was kind of distracting when songs were 'misplaced' by as much as a decade in the movie storyline.
Valli is shown singing "My Eyes Adored You" to his daughter in the middle 1960s, when it didnt' come out until 1975. Then, "Can't Take My Eyes Off of You' is depicted as some big artistic comeback song in the mid-1970s, when in fact it was a huge hit in 1967.
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4) You ever seen Superman $#$# his pants? Case closed.