If you watch a film from the 90s set in another era then there will be things that give it away as 90s, things they didn't remove cos they couldn't see them - they had internalised them I guess and took them as totally for granted. I suppose things like the way their hair was cut when they came into the studio BEFORE it was then given a 1730s (or whatever) makeover.Someone sent me a clip from the original Judge Dredd earlier and it's interesting how you can now instantly tell a film is from the 90s. (Or is that just me knowing it was from the 90s?)
In the 90s that style was invisible but it's becoming more and more visible with each passing year.
I probably couldn't describe it - it's the way it's filmed, the costumes, the dialogue/comedy style, etc.