When Number Six believes that he has been poisoned, he consumes a number of different alcoholic beverages to induce vomiting so he can get rid of the poison. The drinks, in order, are: brandy, whiskey, vodka, Drambuie, Tia Maria, Countreau, and Grand Marnier.
This is the only episode of The Prisoner to feature children living in the Village.
Killer Karminski: Eh, take it easy, sir, will you? Me face is me fortune. You might knock it back into shape!
Sonia: You are a born survivor. I am a born killer. We were made for each other.
Number Two: That one wouldn't drop his guard with his own grandmother!
Schnipps: (to Mr. X) You're not the Duke of Wellington, are you?
Sonia: (to Mr. X) I love you madly. I love the way the hair curls on the back of your neck. You'll make a beautiful corpse. I'm going to do you the honour of letting you die superbly.
Sonia: Mountaineering rope. It would hold an elephant.
Mr. X: I must remember that next time I go climbing with one.
Sonia: You see, when the roocket reaches London, you will be the first to know! Won't that be exciting?!?
Mr. X: I'll just go to pieces.
Number Six: Goodnight children... everywhere.
An actor with the real-life name of John Drake appears in this episode. John Drake was the role Patrick McGoohan played in Danger Man.
Patrick McGoohan (Mr. X/Number Six) does not have any dialogue for over twenty minutes in this episode.
This was second last episode of the series filmed. The last was the finale, "Fall Out".
Kenneth Griffith (Schnipps/Number Two) would later play the President of the Assembly in "Fall Out".
Along with "Living in Harmony", this is one of only two episodes in which Angelo Muscat (The Butler) does not appear.
Christopher Benjamin previously played the same character (Potter) in the Danger Man episode "Koroshi". This lends credence to the belief that Number Six (Patrick McGoohan) is the same person as John Drake, McGoohan's character on the earlier series.
This is the only episode of the entire series to feature children.
It has been said that this script was originally written for the 'Danger Man' series, but was subsequently used in the tale to the children to display Number Six's past to us.