Not all films have distinct contemporary attributes. I get what he means, if you watch all of the Lethal Weapon films you get a consistently strong nostalgic glimpse through the 87-97 time period. Die Hard movies don't have that same quality despite covering more time because the music and the references don't really reflect anything besides John Mclain's peril. The third one does have some period relative storylines though, the outlandish chemical bomb and the frequent use of phone booths are a classic 90's throwback.
The hacker stuff in the fourth one was so dumb it belongs in the 90's...
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