From 1982 to 2007 the trains ran backwards on one of the two tracks.
While never referred to by name, Kings Island was the set of Brady Bunch episode 106 - "The Cincinnati Kids", filmed in 1973. In this episode Mike Brady (Robert Reed) is to present plans to the park for an expansion. These plans get inadvertently switched with Jan's (Eve Plumb) poster of Yogi Bear. The plans are then lost on a ride resulting in the usual antics.
In filming the final scene on the Racer, Robert Reed did not trust the camera was properly mounted to the car and insisted it be tested first. This turned out to be a wise decision as the camera came loose during the test.