I really enjoyed his series of science demonstrations, especially those on angular momentum. It is *so* much easier to do cleanly in free fall.
He did get one thing wrong, though. At one point he taped together three CD players at right angles. He apparently expected them to remain fixed in space when he disturbed them, but they rotated as a unit around an axis at 45 degrees to all of them. This is actually what should have happened, since that was the vector sum of their angular momentum vectors.
It's a common misconception that a gyroscope remains fixed in inertial space against external torques. You can only minimize its precession rate by giving the gyroscope as much angular momentum as you can and reducing those external torques as much as you can.
