I don’t recall this being said in the movie as I watched it again quite recently. Maybe you just misheard it. There actually are some PG films that have the F word in them like Spaceballs (1987), CaddyShack II (1988), Beetlejuice (1988), and Big (1988). But other than that I don’t know of any others, as all those predate this one. The art however is good. Personally I actually enjoy this movie as well.