subtle foreshadowing...

from Game Night episode in season 1 we know that Marshall always wins in everything. Then in the episode where we find out about Marshall and Lily's long-term bets Marshall ends up winning all the bets that are shown: Robin never returns the hairdryer, Barney never watches their home video, Ted doesn't break a leg. So Marshall betting on Ted and Robin ending up together is a huge foreshadowing of the ending. wow i just learned this rn after finishing the entire series