That's in fact very interesting! As most of you know, there's a thread which discusses Doc's "DeLorean explanation" in great detail (and a lot of disappointment came from it). Also, from the very earliest TTG statements about the game, we had inferred that the explanation for the car's re-occurrence was carefully considered and is already there. Now we get to know: There are alternate lines for this, alternate explanations for this situation!
The continuity in BTTF is so incredibly hard to maintain, and even if you somehow manage to do that, the logic known from the movies is so questionable that you'll end up with something moderately illogical anyway. I would have liked if every gamer would have gotten
a different explanation for the DeLorean (so, Doc's answer would be determined by chance in every game). This would have stirred the community quite a bit. Maybe this was actually the plan, but dropped later in fear of possible fanboy p***off reactions (which are always carefully considered by dem boys and girls at TTG

).