Late realizations
I've seen this movie multiple times over the years but only realized a couple of things on this latest viewing.
First, that the park at the end is the same private one that they climbed the fence to enter earlier in the film. (This is when she is amused that he says "whoops-a-daisy" as he climbed the fence.)
Also, when she gave him the Marc Chagall painting that he had in poster form in his house, she mentioned something about it being a gift from home. I think we're meant to understand that she owned the painting (and not that she sought it out and bought it for him). So when she saw the poster in his house, she knew that he had the same taste.
Finally, not a realization, but was it realistic that he could afford that house, given his travel bookshop was failing? I found a site that said the house sold for £2.5 million in 2009. I suspect even in 1999 it would still have been expensive. Perhaps he kept the house in the divorce?