I would like to point out:
1.During the dynamite task I realized behind racers, there's people(probaly racers?)filling up bags with gunpowder(?), maybe the task is: Fill (number) of bags of gunpowder, and bury it, then let's it explode, once it (reaches a certain level) you will receive your net clue.
2.Where's our TAR stalker? The guy we spotted in Cambodia and Tokyo? LOL