When Raymond Shaw is talking with Ben in his election HQ office, he says, "...when we were in Kuwait..." but slurs the word to sound very much like "Korea". The original movie had the soldiers serving in (and abducted from) Korea.
In Rosie's bathroom there is a poster for a theatrical production of "Othello" featuring José Ferrer, the father of Miguel Ferrer who plays Colonel Garret in this film.
When Ben Marco wakes up in the park after the tests at his friend laboratory, he goes back and finds the lab empty. If the FBI closed it down it was worth mentioning.
Ben Marco: This is rich people, Manchurian Global, funding bad science, to put a sleeper in the White House, and that's what's going on Rosie. That's what's going on.