Well you look at the final three teams and all have made some sizable mistakes, some really huge, and what should normally be enough to make you lose.
Jet & Cord should be gone one leg they completely blew, saved because of a non elimination. And the reason they were last. Had nothing to do with luck, or bad taxi's, plane problems, or other issues outside their control.
Another leg, they just assumed they knew what they were doing and took off to the wrong damn town. Thats a huge error. Jumping the gun on getting money for the wrong country, huge error. But luckily for them that was an early leg where teams can often survive making a big error.
Dan & Jordan have made a couple, from dropping cabs, to losing equipment, to their largest sticking with a task (which they did succeed at) but took them hours, hours longer then the field task. That was a huge mistake.
And then we have Brent & Caite, lord where to begin.....