Is there a way to update campground information besides the amenities list? For instance, Knoebels Amusement Resort has moved their webpage, the new url should be: http://www.knoebels.com/stay/knoebels-park-campground
For other information besides the amenities list contact the Help Desk. That is Contact RVPR at the bottom of the home page. They will take care of it.
I have found that there are things that individual reviewers cannot change, but those on the staff of the Help Desk can do. I'm in favor of getting as much accurate info available as possible in my CG research so I second Onemoretrail's suggestion.