So as per Mike's explanation, the chyrons on the show are either descriptive or show status and placement:
Vanessa & Ralph
Dating Divorcees
Rachel & Dave
1st to depart, 1:51pm
Art & JJ
Currently in 1st place
Brendon & Rachel
Getting yelled at while putting on makeup
I made up that last one.
It seems like they show events in the order they actually occur, except sometimes at the very end when they try to manufacture tension.
The two teams are both searching for Coral Kingdom Gate. Dave&Rachel get dropped off somewhere, but with no signs, and the zing of doom. Art&JJ get dropped off...