They showed a bullet in slow motion. The grooves caused by the rifling impression of the barrel were left-handed, but the bullet was spinning in the opposite direction, as shown in the following sketch:
That was clearly wrong. To convince yourself of the mistake, imagine to look at the inside of the barrel, as shown in this classic image from Sean Connery's Bond films (actually, I flipped it horizontally because the rifling in the original image was right-handed):
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