Ted, to your first point about the ship having to be 50 yard above the Earth in the future, that occurred to me when I was producing the video. Actually however, it's not necessarily an issue. The Enterprise would only have to be in the relative same position as where the Lyon Estates were in Earth's orbit at the point of time travel, not literally in the same position as the estates themselves. Plus if you consider the rotation of the solar system through our galaxy, and then the expansion of the Universe, it actually becomes far more likely that the Deloran appears in empty space than in the Earth's atmosphere at all! (At least assuming the literal interpretation of how the Delorean is said to not move through space as it time-travels).

As for your second point, well yes the car probably shouldn't be able to punch through the hull of the Enterprise. But...fact is I don't consider these as being flaws at all. My video is a joke, not a physics lesson. If I tried to account for these in the production of my video, I wouldn't have been able to make it at all, let alone make it funny. Indeed the humor lies in the very absurdity of the whole scenario. Eliminate the absurdity and I'd be sitting at about 30 views instead of over 100,000 and counting.

Hey there, I'm the guy that made the clip. You're right, all the BTTF clips are actually from the beginning of the second movie, but after I thought about it I decided the mash-up would be funnier if I called it an alternate ending to the first film. The Star Trek clips are from Star Trek VI (the torpedo hitting the ship and the interior explosions) and Star Trek III (the ship exterior explosions).