With everyone we mean "everyone" or just everyone we would ask. I can't imagine that an older woman knows what Proton Pack is. Even if we tal over people between 20 and 50 years, I think only a few % know special things like a proton pack, golden idol.
The most people remember costumes, no props; so many people will know how darth vader looks and indiana jones.
Maltese Falcon?!? A classic movie in the USA, but ask around here and no-one will know what the movie is about.
So i agree to Trap Joe, the classic knows everyone, and costumes are the thing what people remember, even scenes from different movies, who are unforgettable. And you can watch these scene as a persiflage in other movies.
So, after all, characters like Darth Vader, R2D2, Indiana Jones, Batman, Terminator, for the some generations maybe harry potter, LOTR...
But that doesnt mean that everyone know the props as well...