After canceling the show a month after its season 2 finale aired, NBC decided to bring back Timeless one last time due to the fans dedication to save the show, for a series finale movie event.
When the gang goes to Korea during the Korean War at Christmas, Wyatt tells them that his grandfather called it "frozen Chosin." The name "Chosin" is derived from the Japanese pronunciation "Choshin", instead of the Korean pronunciation.
The song "Time After Time" at the end of the episode has other time travel connections. Cyndi Lauper originally wrote it about the 1979 movie "Time After Time" with Malcolm McDowell and Mary Steenburgen. The lyrics were also used for the 2017 TV Show called "Time After Time" based on the movie.
December 21st 2023 will fall/fell on a Tuesday.
At 23.40 of part 2, Denise time travels for the first time.