Kirk is noted as 34 in an episode fixed to 2267. Putting his birth in 2233. That put Wrath of he's 50 in 2283. But the official timeline makes it 2285, so maybe he's "celebrating" 52 pickup.

It's as simple as finding out in a later season "George Sr. paid for Mary's part of the trip out of pocket, and also had paid in advance Sheldon's Caltech expenses with a trust. If George Sr. hadn't set up a trust fund for Sheldon, and another for Missy but not Georgie..."

Yes, likely her divorce was invalid, so she and Georgie have to get married again. Thus it can become their second marriage. And then something can happen like the minister who did their second marriage didn't sign the marriage certificate, so they have to get married a third time. Then Sheldon would be the usual literal guy referring to Georgie as being multiply divorced...

At the time it came out, I think many of us felt that without Crispin Glover and without Claudia Wells, something was off. They missed the opportunity of Marty coming back and having Jennifer now suddenly played by Elizabeth Shue perhaps being explained by Doc Brown as "subtle changes to the timeline that have no effect on what has happened"... And creating a fake Crispin in the future was dumb. It would have made more sense to have had them say, "father ed away" and left it at that.

I always thought the prevailing view was that even though Dorothy always had the power, it wasn't activated and available until she went on a traditional "Heroes Journey".

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If that helps you sleep better at night for those who like Glinda, there you have it.

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And for those wanting a different ending, consider this view: the "Wicked Witch of the West" is now dead, but Elphaba lives.