This is one of the few episodes that I really like. It sort of reminds me of the film "The Other Side of the Sun". I wonder just "where" that other Earth was. I'd also like to know just what some of the differences that were found. I know that one of the major differences was the President, and speaking of that, I wonder if there were any other political differences.
For example, I once read a book where Aaron Burr did not enter into a duel with Alexander Hamilton, and went on to become President. I wonder if there were any differences like that, where a person "we" knew to have done one thing, but there they did something else.
In short, I like movies and television series and stories where the alternate version is looked at.