As President Hayes is walking down the hall towards the Oval Office, on his first day, he stops to look at several historical busts. While looking at the last one, a bust of President John F. Kennedy, he bends down to take a long look at it and then stands up and adjusts his tie while looking at a mirror. William Devane played President Kennedy in The Missiles of October (1974).
The Oval Office set used for episodes #7.20 "Inaguration" and #7.21/22 "The Lost City" is the same one used in the motion picture X2 (2003).
After Taken (2002), this is the second time that James McDaniel (General Francis Maynard) played the Chairman of the Joint Chiefs.
General Maynard's shoulder patch is that of the 1st Cavalry Division.