Here are the standing throughout the race:
Leaving the Pit Stop
1. Alison/Donny - 12:48
2. Marshall/Lance - 12:51
3. Linda/Karen - 12:54
4. Bob/Joyce - 1:05
5. Charla/Mirna - 1:08
6. Brandon/Nicole - 1:13
7. Colin/Christie - 1:27
8. Chip/Kim - 1:28
9. Kami/Karli - 1:29
10. Jim/Marsha - 1:39
At the Disco
A little movement here. Kami/Karli move up. Charla/Mirna fall back due to difficulty finding the disco.
At the Ferry
A little movement again. Colin/Christie jump ahead of several teams. Charla/Mira luck out to just make the ferry. All 10 teams are bunched together.
Arrive at Cemetery
Jim/Marsha fall behind while they wait to exchange money (and complain about the moms advising them to do so). They're lucky that 3 other teams (Colin/Christie, Bob/Joyce, Chip/Kim) went to Chacarita Cemetery (where Juan Peron is buried) rather than Ricoleta Cemetery. At least 2 teams ask to go to Chacarita Cemetery but their taxi drivers correct them (Kami/Karli and Brandon/Nicole). Chip/Kim also mention Eva Peron but the driver takes them to the wrong cemetery anyway. We don't hear if the last two teams specifically mentioned Eva Peron to their drivers.
Alison/Donny get dropped off a block or so away and have to find the cemetery.
(We didn't see the order that the last 3 teams arrived.)
Charla/Mirna help themselves by getting a ride on the cart. Alison/Donny also ride the cart and Brandon/Nicole ride back to the entrance.
Linda/Karen and Alison/Donny choose to walk the dogs but can't find the check points. Linda/Karen may have made a mistake by deciding to follow the disfunctional couple. Both teams decide to switch tasks.
Those walking the dogs generally start earlier than the tango people because the dogs are right there.
Even though they switched tasks, Alison/Donny finished 4th. Linda/Karen let 2 teams ahead of them when they picked the wrong dancer twice.
Finishing Roadblock/Pit Stop
The order they finished the race was the same order they did the Roadblock. Three teams decided to take a bus, a pretty silly thing to do since they needed to make up time, especially Chip/Kim (who should have known they were near the back) and Alison/Donny (who had switched tasks). Alison/Donny's bus left earlier than the other but arrived second. Donny mentioned that it stopped a couple of times. (Should have gotten the express.)
Chip & Kami were smart to hold up the taxi until a second one arrived. If one had given up, they might have to wait a long time for another. As long as they were together, they had a chance to win in a sprint.
Marshall/Lance fell a few places while waiting for their taxi to gas up.
Bob/Joyce jumped from 10th to 5th. They must have had quite a taxi driver! Linda/Karen also move up nicely on this taxi ride.
It appeared that Alison/Donny got a taxi while Chip and Kami were having their standoff. It also appeared that they were in the open countryside while the other two teams were still in town. Thye must have had some sort of trouble on the way to arrive at the Roadblock last.
So why did they lose? They were comfortably in 4th place after the detour, but
1. They chose to take a bus rather than a taxi to the cattle country.
2. The bus left earlier but turned out to be slower than the other bus.
3. The left first in the taxi but had some sort of trouble on that final taxi ride.
Their biggest problem was their decision to take the bus. But if the bus hadn't been slow OR the taxi hadn't been slow, they probably would have survived.