Jaime throws the tranquilizer dart at the guard and the close up shows a white hand grabbing it even though the guard is black. The hand also reveals a blue cuff while the guard has fatigues on.
After Harry makes several tries of cranking the half-track's engine and pausing a few seconds in between, the engine starts on its own, before Harry cranks it again.
Experienced agents like Jaime and Harry would know to disarm the unconscious soldier and either destroy his weapons or at least throw them far away from him, where he could not find them when he finally came to. But by their simply walking away from the knocked-out guard, while leaving the AK-47 and pistol just lying on the ground within the merc's easy reach, they were risking his being able to retrieve the weapons and use them to fight Jaime and Harry some more.
In just a few minutes, in the middle of the jungle, Jaime changes outfits 3 times, but she had brought no luggage, and all the other characters wore the same clothes, so it wasn't "movie time" allowance.
After Jaime and the driver are shot with a dart, they fall unconscious within one second , which doesn't give time for the sleep drug to reach their blood.