The Unit insignia (patch) worn by the Army Personnel is the 6th Army Group, which served in Southern France, Germany, and Austria during World War II.
During the set up for Founders day you can see some of the items used in previous episodes like the Atomic Clock from "I Do over"and the rocket that malfunctioned in "Here comes to Suns".
Jaime Ray Newman (Tess Fontana) sings "I'll be Seeing You" not the actress shown.
In 1947 the basics of CPR were being used, also in that year the first human heart was restarted by defibrillation by Dr. Claude Beck a cardiovascular surgeon in Cleveland, Ohio.
The opening credits have a 1940's musical twist.