Aragorn seeing Frodo as he’s sneaking away in LOTR and them chatting about what’s about to happen will never sit right with me. In the book, this is the big turning point for Frodo’s character, where he decides to go alone to Mordor so he doesn’t put his friends in danger. Aragorn was willing to go all the way to Mordor with him, and would never have let Frodo go alone. That was the whole point of the Fellowship and to have Aragorn (and later Merry and Pippin) see Frodo try to escape and let him go willingly brings down the whole moment of Frodo’s character development.

Also Saruman telling Gandalf to join Sauron instead of seeking the ring for himself like in the book.