My first thought was Big - that was on the other day, I noticed in the listings.
I agree that there are a lot of older films that simply wouldn't be made nowadays; not because they're 'inappropriate' or have worrying scenes, but just because they make no sense whatsoever, now that we have the internet, mobile phones and the internet on mobile phones in our pockets. I remember thinking that The Net with Sandra Bullock was space-age, unbelievably advanced technology - which, to be fair, for the mid 90s, it probably was!
Yesterday, we caught (most of) Mike Leigh's glorious Nuts In May on a minority nostalgia channel that I don't think we've watched before. At the end of each ad break, they had a big warning about 'strong language and adult scenes' and I can't possibly think what they were referring to. They do say 'bloody' a couple of times and there's a comically ludicrous fight scene at the campsite, but other than that, not a clue; unless they just always add that by default for everything they show, in case somebody somewhere finds something offensive and complains?!
Some of the satellite channels seem to do this as well: Challenge frequently asks you to enter an 'adult protected content' PIN in order to watch re-runs of The Crystal Maze! They did the same yesterday for the start of an old episode of The Generation Game, before we rushed to turn over!
Also not a film, but there's no way Some Mothers Do 'Ave 'Em would ever be made now. The whole premise is around laughing at an utterly 'stupid' man, who, with modern eyes, very much seems that he would be diagnosed with learning difficulties and/or other conditions, and (we would hope) given support rather than be ridiculed.