I worked at Hersheypark for three years. I got so tired of hearing guests call "Rollersoaker" the "Super Soaker," and "Great Bear" the "Big Bear." Though I did always have fun explaining how "Storm Runner" would close down as soon as a storm was in the area. People would ask, "But, it says Storm Runner right there! So it must 'run' in the rain!" I also once got in an argument with a guest who thought Hersheypark had removed a drop tower from the park... which was explained to be like a 1st generation Intamin drop tower with a themed barn station. No such ride existed there, or possibly anywhere, but the guest was almost screaming at me when he finally gave up.
At Cedar Point, I heard a lot of people ask where to get on Magnum (which until 2009, didn't have an actual big sign at the entrance, only an A-frame sign with the logo and wait time). Also popular, people asking about The Beast (which is at King's Island, another park in Ohio), and of course "Magnum Force" and so on. My favorite is during the "Running of the Bulls" in the morning, when people sprint down the midways to the six or seven rides open early, but literally every day people stood in front of rides not open for another hour, thinking they'd be open.
My favorite was hearing guests repeat rumors that other employees told them... like, "Oh the games guy told me they're moving Space Spiral (observation tower) to the back of the park next year," or rumors of moving just about everything from the then-closing Geauga Lake to Cedar Point. "Oh yeah, they're moving half the park here!"
About a year ago, I overheard a teenager say this to his group on the bus ride over to Universal: "My uncle works for Universal, so he got me on the big new Harry Potter rollercoasters." Really? I would have liked to see this kid try to explain how DD was open that day.