In the show, the changes to the scene serve as a reminder to who the character of Jaime is. It serves a very different purpose than the equivalent scene in the book.
As far as the unsullied thread, let's see what they say after next weeks episode, or the week after, or when the season is done, or when we catch up to where the books are. This is an evolving process.
As a point of wildly different comparison, I remember a lot of people in the book thread last year complaining about the guest rights during the Red Wedding, how they didn't really explain it adequately even though they showed it, and that show only watchers likely wouldn't understand the significance and that the showrunners really botched it. Well, lo and behold, in last night's episode there is an entire scene with the Hound and Arya where they are discussing the Red Wedding, and how the Frey's broke guest right and how that is very important for certain people, and that family is surely cursed now. Similar things have happened numerous times throughout the series up to this point, where the show explains things in a different place than the books, or at a different pace, and book readers get all worried that show watchers will be too confused, only for the show to explain it in the next episode or next season.
My point being that the show is doing its own thing at its own pace, and will explain things to the audience when it thinks it appropriate. They don't need to develop Jaime in the same way at the same pace as the books, and show readers don't need to feel the same way about the characters that we felt when reading the books.