I also know that if you saw the golden spheres laid out on the stage floor at the beginning of a show when Bob came out, you knew Golden Road was to be played as the first pricing game.
Somebody noticed this at one point, so they started keeping the camera pointed at Bob in such a way that you could not see the floor, but of course that just meant that if they didn't show the floor, then GR was being played. Later, when Bob started coming down from the audience (other than when he first did it, on an April 1 episode), that was almost always a sign that GR was going to be played. (I think he later started coming down through the audience whenever they started with a game that needed all three doors, like Superball, but I'm not entirely sure about that.)
There is at least one early episode where, just before he introduces the first item up for bids, he says something like, "You know, I think we're playing Golden Road today!".
