Something that I'm having a hard time wrapping my brain around in these epsidoes is Einsteins timeline.
When einstein shows up at the beginning of episode 1, when does he come from? It can't be a later time travel Doc and marty make as the timeline does not work that way. If it is after doc is initially killed, how did he get ednas shoe? It doesnt seem like the shoe has been stolen yet from what we see.
Should there have been 2 einsteins in hill valley while marty was breaking doc out of jail?
Also why on earth did they leave einstein there? When they first leave 1931 (not realizing they are returning to a compromosed timeline), the plan is for doc and marty to return to 1986 and doc to iron out his estate. But einstein was with 1931 doc and not like 1986 doc can go back and pick him up from his younger self, he'd need marty to do that anyways so why did they bother leaving einstein there where a) it would mean they'd have to make another time travel b) they'd be putting einstein in danger leaving him in a foreign time period and c) potentially changing the timeline if einstein being with young doc somehow created a ripple effect