It's refreshing to see George C Scott play the role of a genuine Nice Guy. Without seeing the film, it's hard to imagine that the man could be so pleasant.
Claire's relationship with John. It's apparent from the very first time they meet that Claire is determined to improve their acquaintance to a friendship, if not more. Presumably, as a friend of the Lingstroms, she is well aware of the recent tragedy and wants to bring John out of his grief. On his part, instead of dishing out the expected response of Don't You Dare Pity Me!, John is happy for her to become his friend, even though he shows no romantic interest.
John's students are clearly a bit in awe of him. It's testament to his fame as a composer that hundreds turn up to attend his first lecture, even though it's supposed to be a class of 23. It's also nice to see how easily John handles his audience and how well he gets along with his students.