1983 seems like a huge transitional year for TPIR from what I've seen. (And this opinion is solely mine, and possibly filtered through the lens of it being the show I remember watching at age 4 or 5.) Plinko's debut that January is probably as good a line of demarcation as any for the show moving from "daytime staple" to "cultural touchstone," but you also can see the set revamp leading up to it. It also seems like as the year wears on, there's a bit more variety to the prizes and the overall production gets cleaner and smoother. You start seeing fancy wipes, occasional shows with two car games and a cash game, and by the time the 83-84 season starts, five-digit car games. Then you get things like the tugboat and the robot, new games with fancier props - it feels like CBS/Goodson suddenly had more money to throw around and put it into the show.