I think having a detour, RB, and ARI task in the same leg (besides a finale) is too much. The ENTIRE episode would have to be devoted to showing the tasks, and as it is, FAR more time than in the early seasons is devoted to showing all teams completing the tasks. You have to watch the online cbs.com videos these days to hear some of the fun banter that takes place in the cabs/cars. I've always enjoyed that more than the tasks.
If they edited out a pony-dressing task last night (which I doubt), then so be it. In its place, they let us get more actual team interaction, like Kym and Alli going to the pub, a few tidbits on the train, and gorgeous scenery, which would not have been possible if they had to edit in another whole task in addition to what was shown.
A better alternative would be to have 90 minute episodes. Hey, one can dream, right?!