Julianne Moore is a big fan of Downton Abbey (2010). Since Michelle Dockery is the main character of Downton Abbey and portrays Nancy in this film, Julianne would ask Dockery for possible spoilers and secrets of the show.
During the news report, the reporter says that Marks wasn't born in America, but Northern Ireland. This is a reference to Liam Neeson who is originally from Northern Ireland. Also, Marks' US passport list his place of birth as 'Belfast, Northern Ireland'.
After the news reporter states that Liam Neeson's character Bill Marks, was born in Northern Ireland, a passengers suggest that he may be a member of the I.R.A. Liam Neeson played the character of Michael Collins in Michael Collins (1996), who was the founder and leader of the I.R.A.
The aircraft is clearly fictional, a type is never referred to during the course of the film. Whilst it appears to be the size of a Boeing 767-400, the cabin interior, door operation & arrangement and flight deck layout do not match this type of aircraft.
The trivia items below may give away important plot points.
When Tom Bowen describes the person who told him to talk to Marks at the airport, the description of a white male, 30-35 years old and wearing glasses is fitting of himself, a hint at who the bad guy really is.
When Marks opens the briefcase again to remove the cocaine, the timer inside reads exactly 13:37. This number is a reference to leetspeak, an alternative Internet alphabet used primarily in online gaming and computer hacking circles.
Both Liam Neeson and Linus Roache appeared together as Henri Ducard/Ra's al-Ghul and Thomas Wayne, respectively, in Batman Begins (2005); as well as cameos of the same roles in The Dark Knight Rises (2012). In the two films, however, they never shared the screen together.