When has the race featured or acknowledged individuals or teams that raced in previous editions of the race?
The only instances I can think of are:
During the Season 15 Switchback Roadblock, a replay of Lena & Kristy from Season 6 is shown.
In the Family Edition, Kevin (or was it Drew?) hands racers a clue in New York.
Are there any others like this? (Not including All-Star seasons obviously)