I'll have this in greatest specifics when I update the ranking the teams thread list for TAR 20, but Rachel-Dave are the best performing placement average for a winning team (1.8333), greatest percentage of winning legs on a Race (67%), most number of winning legs (8 of 12) surpassing Meghan-Chenye TAR 15 (7 legs) and Nick-Starr TAR 13 (7 legs), and second best team overall performance placement average (second only to Eric-Jeremy in TAR 9 (1.6923)).
Rachel-Dave are the first team ever to avoid elimination on a leg while not completing a detour or a roadblock and not having a fast forward available. They're also the sixth team to win the first leg and win the Race. (Rob-Brennan TAR 1, Tyler-James TAR 10, Nick-Starr TAR 13, Meghan-Cheyne TAR 15, Enrie-Cindy TAR 19)
Rachel-Dave are the first team ever to reach the finish mat on the final leg and be turned back for not completing a task (in this case, a second roadblock).
Mark and Bopper are the second team to win a fast forward and be eliminated. (TAR 3 Dennis and Andrew).