The speed of the bomb's countdown is inconsistent with the timing of everything else that is going on at the same time.
One of the plot points is the issue of a moving river's effect on a property boundary. Even though it is a common practice for a river to be used as a boundary line, the likelihood that a river may move has been known for a long time, and land surveys are *never* tied strictly to the presence of a body of water. Steams or rivers may move, completely change course, or even dry up, but this has no effect on a boundary line, as surveyors mark the property line based on the water's location at the time of the survey. Assuming the original survey was properly done, there should be no question of the correct location of a property line, regardless of the river's current location.
When MacGyver uses the high-pressure pipe to batter down the door of the room the minions held him in, he released the pressure by turning the valve clockwise.
This would tighten/close the valve, not open it.