Factual error: When you first see Sam he is supposed to be in America, but when you see out of the window as he is leaving, you can see the Gherkin building in London. He is actually in the Lloyd's Building, but to add to the illusion of being in America, he is picked up by a Yellow Cab.
Factual error: Sam and Donna would not be able to marry. There are things which need to be done before it is legal for two people to marry and it is therefore not possible to marry minutes after proposing.
Chosen answer: Meryl Streep and Pierce Brosnan got married because they loved each other and had done for many years. The daughter changed her mind about getting married because she realised what really mattered to her and that seeing the world while they were young and free wasn't such a bad idea after all, that she didn't need to get married and hang around for her mother's sake.
Purple_Girl