Dr. Rydell suggests that Sam join a group session run by her colleague, Dr. Heinrich Müller. She then says that "those charges linking him to the Gestapo were grossly exaggerated." The real Heinrich Müller was head of the Gestapo from September 1939 until his disappearance on May 1, 1945.
In keeping with the discussion Rebecca and Sam have about the Three Stooges, the music that plays as the closing credits is a credenza featuring the last measure of the Stooges theme music.
The wall thermostat next to the brass ship's wheel vanished after the 8th episode of this season to support the "Rebecca's bottom" gag in the cold open of episode 9. It this episode the wall thermostat reappears in its previous location.
At the four minute mark, when Sam leaves the bar to chat up Dr. Rydell, a blond extra in a white sweater seems to make a misstep by walking to the bar then turning to leave Cheers. She catches the attention of a male extra sitting next to Al.