Final appearance by Warren Frost (Doc Hayward), who died in February 2017. There's a dedication for him at the end.
The tune Gordon Cole whistles sitting in his office is the beginning of the song "Engel" by Rammstein.
In the final scene, Sleep Walk plays in the background while Mädchen Amick works in the diner. Sleep Walk is also featured prominently in the movie Sleepwalkers (1992) which she also starred in.
The wristwatch Andy is wearing is a Rolex Oyster Perpetual Date, "Superlative chronometer, officially certified". The retail price is over $6,000.