The original Poltergeist is rated PG. I believe that it was initally given a R rating, but it was appealed and they got the PG (again, predated the PG-13 rating). I'm not sure if anything had to be cut or not. Funny though, a few years back, my younger brother, probably around 10-11 at the...
Well, one character nearly dies on camera because of a Quualude overdose. There is a lengthy on camera sequence of Russel tripping on Acid. Don't forget the colorful term used for oral by Penny Lane and the shot of her dancing around topless (breif, but doesn't help the case for PG-13). Oh yeah...
"Parenthood" is another one that just came to mind. There was some very frank sexuality discussions. A few thinly veiled allusions to oral sex. A Dildo used as a comic setpiece. Discussions and near visualizations of pornography and even drug references. It did really push the limits of PG-13.
Another oft mentioned film like that was "The Andromeda Strain" It has a G Rating but there is a shot of a bare chested female corpse, a scientist cuts into a dead man's wrist which releases powdered blood and there is a pretty realistic depection of a monkey dying from exposure to a virus, not...
I was having a discussion with my girlfriend about what some of the differences between what gets a film a PG-13 vs and R Rating. It led me to think of films that just seemed to squeak by with a PG-13, some of the "hardest" films that got by with the rating, films that I was surpried was only...