First time poster, please be kind...
From what I've seen in the promos, Andy receives the clue at the roadblock while Ernie is still dancing so they are ahead heading to the detour. It's quite possible that they manage to finish the butter just seconds before Ernie and Cindy and that they decide not to use the u-turn because they know they can outrace them in a foot race.
Also from the promos we can see Bill and Cathi completing the bunny hop with no teams in sight which leads me to believe they chose that side of the detour. Later, Amani and Marcus (who we assume are running behind) are on the bunny hop and we can see Laurence and Zac's lane not quite finished in one cap and we can see Laurence and Zac standing in their lane with a third person (judge?) in another cap. Zac is finally running his bunny as Sandy and Jeremy run by.
My best guess is Ernie and Cindy had the option of u-turning Zac and Laurence or Sandy and Jeremy and chose Zac and Laurence knowing they can be fast and it would explain seeing them on the bunny hop behind Marcus and Amani.
Cindy's sound-bite could be 'important' because Zac and Laurence may be eliminated because they u-turned them.
Andy & Tommy
Ernie & Cindy
Bill & Cathi
Jeremy & Sandy
Marcus & Amani
Laurence and Zac
Of course, that's assuming Sandy and Jeremy just ran by the bunny hop completely lost trying to find the u-turn. LOL