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The only part of the video that was live flight was so far away, and by that point, on such a flat trajectory that no visual data is of use. (how good is your depth perception for something hundreds of miles away?)

The video begins with the vehicle a long distance away, in great circle flight. The initial launch was shown only in pan.

Again, everything that was shown was powered flight. If you were watching this from sea level, the farthest you can see past the horizon (of something at 30,000 feet just as an example) is about 180 miles and it would appear right on the horizon. If it was traveling away from you from launch onwards and was that far away, you'd never see anything. If it was at 30,000 feet (in your "flat trajectory") when first spotted and remained under observation for the next 10 minutes, it would have to be traveling between that distance with part of its vector toward the east where you are observing it. If it was traveling westward from an initial point "hundreds of miles away" it could not have been observed over the course of 10 minutes. If it had been traveling in an easterly direction from hundreds of miles away and was visible for at least 10 minutes and was still under powered flight (as evidenced by the exhaust trail) and in a flat trajectory (which wouldn't be the case with a ballistic missile), after 3 to 5 minutes, less if a solid rocket booster, it would be traveling at almost 16,000 miles per hour. If this had been traveling under power for more than 3 to 5 minutes, it would be traveling even faster. Start at 200 miles away and see how far it would travel at over 15,000mph for 5 to 7 minutes. Answer: 250 miles per minute or 1250 to 1750 miles over the course of 5 to 7 minutes. If the "missile" appeared in the west, "hundreds of miles" away and was traveling with some degree of easterly travel, then after 3 to 5 minutes, or less if solid rocket boosters were used, it was traveling at about 16,000mph, it would have traveled far to the east of the observer in the amount of time it was being observed. It didn't do this. If a jet was spotted on the horizon at 30,000 feet traveling toward the viewer at sea level, it would cover a distance of about 190 miles. If it was traveling at, say, 461 knts (461X1.15mph= 530mph), then it would take 21 minutes from first appearing at altitude over the horizon to pass overhead. If it was being observed for at least 10 minutes, then during this time it would have flown about half the distance and been about 95 miles or about 10 minutes away. If it had been a missile traveling in the same direction, then, after 3 to 5 minutes, it would have flown another 5 to 7 minutes at 16,000 mph, putting it at a distance in the same trajectory at least 1250 to 1750 miles farther less the 90 miles that a jet would have traveled--in other words, at the end of 10 minutes an incoming jet would still be seen to the west out over the Pacific. At the end of 10 minutes, a missile under boost in a "flat trajectory" would no longer be seen.