One thing that did come up in the press conference that I hadn't though of, but which could be a mess to sort out, and could even result in the "wrong" answer (i.e., it could cost Biden votes, and conceivably shift a state back to red.)
There will undoubtedly be people who voted by mail and then checked whatever tracking method was available in their state, and saw that their vote hadn't been received. So, they went and voted in person, but their mail in ballot was received and processed at some point.
I know that there are supposed to be checks to prevent that sort of thing, but I'm sure those checks are not perfect, so there will undoubtedly be some people who voted twice. And, of course, a few weeks ago Trump actually encouraged people to do this, so it's a safe bet that will happen. That could be a mess to figure out.
I see also that a lawsuit has been filed complaining that election officials did not notify every single voter whose ballot had been received and rejected that it had been rejected. Some states have laws that say that a mailed in vote which is flawed, and so won't be counted, requires the state to notify the voter. Undoubtedly, this is true. There will be cases where that system didn't work. How many, and what to do about it, is pretty difficult to answer.
So, there will be courtroom dramas trying to sort this all out. There will be recounts as well, it appears, and the second count will not match the first. Trump supporters will be upset I'm sure, because Biden will pick up votes in the recount. (I followed the Minnesota senate race with Al Franken pretty closely. It seems Democrats aren't as good at following directions. They cast a lot of perfectly legal ballots, but which machines couldn't read.)
So anyway, the lawsuits are part of the process as well. Everyone gets their day in court. I'm confident that while people will try and twist it, in the end I have faith that the goal will be to get an accurate count, and elect the people who won the election. I think that will be Biden/Harris, but if it ends up Trump/Pence, so be it.
And if Biden wins and Trump tries to steal it? (Biden won't do that, but Trump would.) Well, I have faith he won't succeed. There's only so far that Senators and judges will go.