SPOILER: The scene in which Chuck appears to shoot his target and in which it is revealed that actually Casey shot him mirrors the scene from this movie, in which Ranse seems to shoot Liberty when, in fact, Tom Stoddard does. Also, in both intances, nobody may reveal what has actually happened..
In the scene with Casey and Big Mike in Subway, both are in bespoke suits. Big Mike, at seeing Casey, tells him "Looking good, John", with Casey replying with "Feeling pretty good." These lines paraphrase the "Looking good, Billy Ray!"/"Feeling good, Louis!" lines from the movie.
Chuck is in a restaurant with Sarah. He thinks he's there for a nice dinner, but in fact he is given the mission to kill someone, as a test for becoming a spy. The same final exam is given to the lead character in Nikita.