Factual error: As the guys zipline down the electric cables, they continue past every pylon without a problem. Cables are connected to pylons, so the connections to the zipline couldn't move past pylons freely. (00:08:10)
Factual error: In the opening sequence, there's a bit where they lower a door/ramp at the back of the plane to load jetskis onto it. They only show the door opened from inside the plane, probably because looking at it from outside, the actual plane tapers off towards the end, and doesn't have space for a large access ramp like that. (00:12:15)
Answer: The words of their chant are "Beware, beware, walk with care. Careful what you do. Or Mumbo Jumbo's gonna hoo-doo you. Mumbo Jumbo's gonna hoo-doo you. Boomlay, boomlay, boomlay, boom!" This comes directly from a poem titled "The Congo" by poet Nicholas Vachel Lindsay ("The Congo and Other Poems"), specifically the lines at the end of part I.
Super Grover