In the recent Comic Con panel, Maisie Williams mentioned that there are some characters that have been killed in the show, that haven't been killed in the books, and vice versa.
What characters is she referring to? For example, in Season 4 Episode 10 (spoiler,)
Jojen Reed dies. He hasn't died in the books yet.
Are there any other such characters?
Also, which characters have been killed in the books, that haven't been killed in the show? (Please don't mention it, if they are potentially killed in future of the show).