After going through the whole game again, I gave a lot of though (admittedly, perhaps TOO much thought) to the whole issue of the 'new' Doc who shows up in Episode 5. There have been a LOT of threads on the subject of this new Doc on these boards...but most of them have been with regards to where his Delorean came from and whether or not he's the same Doc who was in Episodes 1 and 2.
However, what I'm curious to know is the state of this new Doc's memories.
We know that the new Doc is the future self of the teenage Emmett Brown we have been interacting with in Episodes 1-5. He remembers meeting Marty in 1931, he remembers dating Edna and then breaking up with her, he remembers patching things up with his father at the Expo, as a result of which, he ends up running his late father's Foundation and becomes a more respected figure in town. He has never (to our knowledge) seen Frankenstien...instead, he derived his inspiration from watching lightning from atop the Clock Tower in Episode 4.
However, this Doc has also been through all the events of the movies, or at least that's what we've been led to believe. He definetly remembers the events in 1885, and he's married to Clara and has two sons, Jules and Verne. The only difference is that after the events of the movies, he chose to return to 1986 and settle down.
Now, the first issue I have with regards to Doc's memories is-why doesn't he remember the original timeline?
I think most people agree that time traveler's usually NEVER forget their original timeline. Marty, for instance, still remembers his Twin Pines history with loser parents. There's a lot of debate about whether or not time traveler's would have memories of the new timeline (I personally believe they do), but no one denies the fact that they always remember the original timeline (from which they first started time travelling). Now Doc definetly recalls the new timeline, where he and his father patched up and he lives in 1986...but why doesn't he also remember the ORIGINAL timeline in which he and his father continued to have a troubled relationship and he never returned to live in 1986? Why is he surprised when Marty tells him about how he never returned in the original timeline?
That said, if we assume that the new Doc is a TOTALLY different entity who can NEVER remember the original timeline...then the question arises...does he have memories ONLY of ONE version of the revised timeline, or does he have memories of SEVERAL previous timelines?
What I mean is, does the new Doc remember the local ravine only as Eastwood Ravine, or does he remember it once being called Clayton Ravine? Does he remember finding the Delorean at the Delgado Mine in 1955 and sending Marty back to 1885, or does he remember simply going back home after the lightning bolt at the end of BTTF1?
If Doc can remember the ravine being called Clayton Ravine in a previous timeline, then why wouldn't he remember having a bad relationship with his father in a previous timeline?
I know I'm thinking too much into it...but I'm really confused about this new Doc's personal timeline.