I thought they did a really good job casting an older Abigail who looked a lot like the younger one.
I'm confused as to when Henry decided to trust Abigail and tell her he is immortal. Seems like her reaction when she was young was that it was no big deal, but when she got older she no longer had the carefree attitude about him not physically aging. She said something about "poor Henry, you'll be around long after we're all gone" when they were at the USO (?) dance. Another time she joked about liking older men when Henry was making his hair grey.
The timeline continues to be shaky. As mentioned before, were they on vacation when they crashed the museum party? Where was Abe? They weren't married yet (he proposed after Gloria encouraged him), so I doubt Abe could be adopted at that time. Also, what did they tell Abigail's parents about Henry's appearance or did they cut all ties as Abigail started to get older?
Finally, I hope they clear up the mystery about what happens to Henry's clothes and belongings after he dies. The watch doesn't always stay with him (left in cab). The watch could be like "The One Ring", though. Oh, and in 200 years and numerous deaths, NO ONE has seen Henry die and disappear except for the priest and Abe?