Jacki Weaver's performance stuck out as cartoon-y to me, so I am really displeased with her inclusion (ESPECIALLY when compared to the likes of Samantha Barks, Judi Dench, Maggie Smith and Nicole Kidman). Really a ridiculous nomination. That role does not merit Oscar attention, and her performance was sub-par.
I would echo the same of Alan Arkin, who, though very good in a small role, just doesn't even compare to the thrilling performances of Javier Bardem, Eddie Redmayne, and Leo DiCaprio.
Affleck and Bigelow seem to be the victims of over-confident voting, in that everyone probably just expected them to get a nod so they put their support in less favored options.