Question: At the end, are John and Sara married? She's wearing a ring, but he is not. Perhaps they're just engaged?
Question: At the end of the movie when Jonathan is lying in the middle of the rink, you can see the skaters skating around him. However, everyone is wearing roller blades, not ice skates. I was under the impression that this was an ice skating rink, not a roller skating rink. Am I wrong about that, or is this another blooper?
Answer: It is not a movie mistake. The scenes were filmed at the Trump Skating Rink (formerly called the Wollman Rink) in New York City's Central Park. The arena has traditionally been used for multiple venues throughout the year including ice skating, roller skating, concerts, carnivals, etc.
Question: If Jonathan thought Sara was with another man, why did he call off the wedding with Halley?
Answer: He didn't want to marry Halley anyway.
Question: Am I wrong? Didn't Sara write her name and number on the $5 bill and buy mints with it at the newsstand? Then, when she was on the airplane and saw the $5 bill again, it had Johnathan's name on it?
Answer: Jonathan was the one who wrote his name and number on the $5 bill Sara used to buy the mints and then got back later on the plane. Sara actually wrote her name and number in the front of a book she had on her, which she then sold to a bookseller, and Jonathan's fiancée bought it as a wedding gift for him, not realising that it happened to be the same copy Sara had written her details in.
Answer: They are engaged and celebrating the day they met each other.