I'm an avid reader of the 'goofs' section on IMDB movie listings. Most of the Goof's don't impress me much... some are silly, even if accurate, but some are GREAT... for example.
If you ever watch Spartacus, with Kirk Douglas, on a LARGE screen yes, you can see some of the army in the background wearing UCLA Sweatshirts.
Watching all these old movies I've noticed another, what I consider, "goof". Reactions from the characters. Many in the old Hitchcock films where I can't help but thinking "No one would EVER react that way".... or perhaps better said "I certainly wouldn't do that".
So I guess those aren't really 'goofs', just people doing really amazingly dumb things.