I would assume that the commercial was on in NJ because Dorney Park and Wildwater Kingdom (located 20 minutes across the New Jersey border) is the sister park of Cedar Point and they run the same halloween program. Also, anyone with a Cedar point or Dorney Park season pass can use them at either park anytime during the year.
Halloweekends are OK at the parks but nothing really out of the ordinary. The park is decorated with cobwebs, hearses, tombstones and the like. They have a few people in costume walking around also. They do NOT want people to arrive at the park in full costume (you will be asked to leave if you do.) They usually make the train ride around the park a "scary" one (but not too scary because of the kids in attendance).
There is usually a section set up with various mini houses that are staffed by nursery rhyme characters. The kids can go from house to house to collect candy for free. The best part is, there are not a whole lot of people who go in the early parts of the day. This leaves you plenty of time to go on the best coasters without waiting in line. Downside is the park hours are usually shorter. Have fun.
Adam aka Big Dude