During a flash back scene, Henry is in the Diogenes Club. This is a fictional club created by Sir Arthur Conan Doyle and is mentioned frequently in Sherlock Holmes novels.
Abe's WWII concentration camp tattoo number from Auschwitz is: 432289 and the location of the triangle indicates 1945.
Two of the paintings that can be seen in the bank vault are "Portrait of Fritza Riedler" by Gustav Klimt, and "Portrait of a Man, Said to be Christopher Columbus" by Sebastiano del Piombo, the latter painting in a cropped version.