[Eomer of the Rohirrim]

The movie does not tell us, but we can probably assume that they did fight at the Hornburg.

Tuor, I had thought that it was just Gamling who was restrained by Hama, purely because he was standing right next to him and it would be easy for him to stop him.

This easy corruption of the Rohirrim is hard for me to digest. From what we can gather of Eomer and the Rohirrim from the book, it seems that Eomer was a well-liked character. The appendices tell us that he was not an ambitious man, that he was not too interested in glory (a fault in some of Tolkien's warriors, and a trait which may not endear to the average soldier).

I think it is probable that the filmmakers had to give Grima some henchmen because otherwise, nothing would compel Eomer to leave Meduseld. In the book, of course, it was the King himself who ordered him to prison. I suppose this discussion turns again to why the Director invented this storyline instead of going by the book.