The establishing shot at the very beginning of the episode is not of a back lot, but stock footage of an actual location taken in the early to mid 1960s. Wing Woh Lung was a grocery store located at 50 Mott Street at the corner of Bayard Street, in Manhattan's Chinatown. It went out of business in the early 1980s.
The title refers to the Swedish movie I Am Curious (Yellow) (1967). When shown in the USA it was titled "I Am Curious (Yellow)" and rated "X". "Yellow" refers to one of the colors of the Swedish flag.
Last show of the series.
Larabee has the final line of the series.
The next Get Smart project was The Nude Bomb (1980). Don Adams and Robert Karvelas were the only regular cast members from the original series involved with the film.