I'm trying to figure out if The Ride and The Animated Series are compatible with each other. Both were released in the year 1991. Here is what I think might happen.
Perhaps, the after a couple years, the Brown family decides to settle back into the future - since the boys do seem to be a few years older in TAS. Of course, they'll need a good explanation of where his wife and children came from. Then, after awhile, he sets up the Institute of Future Technology. Perhaps, Bill Nye is one of his time travel associates at the IFT - and a certain wing of the IFT is using for Doc to teach his budding young scientists.
After a few months of working with his colleagues, he finally lets them in on his secret - and, of course, he swears them to secrecy. He then purchases another DeLorean, which they use for time travel experiments.
Then, sometime later, he purchases another DeLorean - and creates a device that allows the DeLorean to travel to places outside outside of Hill Valley. That may even be the DeLorean that he used to visit Edison, the Wright brothers, Einstein, et al. He decides to keep that one for home use, though.
Then, finally, he creates the eight-passenger DeLorean - which the time travel volunteers were the first ones to use.
Also, sometime between 1986 and 1991, Marty gets seriously injured - and is in a coma for a few weeks. He never fully recovers - and, as such, that's why he's such a dufus in TAS. Also, from spending a lot of time at the IFT, Doc has grown accustomed to using technical speech even with his family. Of course, Jules takes after him.
How does that sound?
If we throw in The Game, it would make things even more complex. Of course, there is a conflict between The Game and the TAS episode "Gone Fishing". I'll have to re-watch that episode, but it might not make a big difference to imagine that the events of that episode occurred nine years earlier. Beauregard Tannen exists in both TAS and The Game, and he very well could be the same person.
I suppose the events of The Ride and TAS would occur in the final timeline. I guess Doc decides to live part-time in 1985-1986 - and then, a few years later, he finally decides to bring his entire family into the present. That also gives him plenty of time to set up the IFT.
There is only a question of when exactly Future Doc of Episode Five decided to show up in 1931. At first, he was very confused by what Marty was doing in 1931, and he seemed to not remember being "Carl Sagan". Then, I guess, after returning to 1986 - he runs into his older self*. His older self is then able to finish his present for Marty, and then gives it to his younger self to give to Marty.
* Remember, there's still that part in Episode Three where Doc vanishes - upon returning to 1986. In the final timeline, he wouldn't vanish. So I guess my theory is the it's a slightly younger older Doc we saw in Episode Five.
If you want to go even further, we could also figure out how to include the Looney Labs card game into the expanded universe.
It's best to not even try to include things like the DirecTV advert, the Nike advert, the Check Your Coat music video, the Microsoft Tech Ed, the Universal Studios Promo, or the Earth Day special into the expanded universe - but I think including the adverts for Garbarino can fit into the expanded universe, quite well.
These videos include:
Doc Arrives in Argentina 2011
Security Video Footage
Doc at a Conference
Garbarino vs Doc's Garage
Young Emmett and His Mother
I think they actually could fit into The Ride Universe, specifically.