When President and Mrs. Kirkman wave to the crowd from the hospital window, this was reminiscent to when President and Mrs. Reagan waved from the hospital window days after President Reagan was shot by John Hinkley.
The ringtone for the phone when Aaron Shore answers the phone is the same as in the show 24 (2001)m which starred Kiefer Sutherland (Tom Kirkman) as Jack Bauer.
This episode takes place in February 2016.