In the Full House episode "The House meets the mouse" when Dj and Kimmy are riding the bumper cars, Dj waves at the camera right before they do the shot of Michelle and Danny.
I just saw this one and had to comment. It's halfway through part 2.
This episode seems to be less for entertainment value and more for marketing value. Since Disney owns ABC, which originally aired Full House, using one of their shows to promote a Disney theme park is useful and cost-effective.
More to the point: I don't think this is a slip-up. I think it was intended to mean "look how much fun you can have here."