At the end of the episode, Larabee hits the gong and places Chief and CONTROL under his power.
Despite Edward Platt's actual age of 54, in this episode the Chief announces that he is 42 years old.
A gravestone with Max's name gives his birthyear as 1930 which means he is either 39 or 40 years old at the time of this episode (by the way Don Adams was born in 1923 making him 7 years older than his character).
Max doesn't face any KAOS agents in this episode.
Goof: In this Arctic set adventure, Shtarker says that he prepared a meal from the penguins wandering nearby. Penguins are actually native to Antarctica on the opposite side of the world.
This episode has the longest opening sequence of the enitre series at seven minutes and fifteen seconds. Being a two-parter the time is filled with a recap of the previous episode which was adopted for series 4 and 5 when airing two part episodes.
99 gives birth to twins, a boy and a girl. Although the babies' names are never actually revealed in the series, it is quite likely the boy grows up to be CONTROL agent Zach Smart (Andy Dick) the star of Fox's 1995 revival of "Get Smart". The fate of Max and 99's daughter remains a secret.
In a scene in Chief's office, Larabee hangs his head outside the window to give a shout to the president. The White House is clearly visible to be a nearby building.
It is mentioned several times during the series that the Control headquarters (with the Chief's office as well) rests several stories below ground, so the latter mentioned could not be possibly achieved.
Goof: In the Chief's office while listing all the various failed methods attempted to break the glass cell Max mentions hand grenades, something that was never tried.
In this episode 99 reveals her pregnancy to Max. This subplot leading to the birth of twins and the resulting issues of juggling parenthood and spy career will play through the rest of this season.
In the original CBS promo for this episode, Max can be seen crashing through the wall (at the end of the teaser) and continuing to run but in the episode itself the scene ends in a freeze frame just as Max hits the wall.
In this episode the Chief reveals that the "Cone of Silence" was invented by Professor Cone.
This two part episode is a sequel to "The King Lives?" from last season. The take-off of the movie "The Prisoner of Zenda" continues as Max once again switches places with his lookalike king (ala Ronald Colman) and James Caan appears as a swashbuckling villain inspired by the Rupert of Hentzau character played by Douglas Fairbanks Jr.
If you look closely during the scene were the Chief is making out with Gina in the park, 99 is wearing heels as she walks by. This is interesting due to the fact that for most of the series run Barbara Feldon wore flats so that she wouldn't tower over Don Adams, who was about three inches shorter than she was.
During the wedding vows we do not hear 99's real name as the Admiral's snoring covers her actual name that was said during the vows.
Although only two episodes ago Max chose Hymie as his best man, the Admiral fills the role at the actual wedding. Incidentally, the Chief gives away the bride.
Max and 99 inform the Chief of their engagement in this episode.
Two supporting CONTROL agents in this episode are named Karvelas and Szathmary. Robert Karvelas was the name of the actor who played Larabee while Irving Szathmary was the musical composer for the show.
Aside from the funeral at the beginning of this episode, Max doesn't encounter any members of KAOS in this episode.
With Max promoted to Chief, the former Chief of CONTROL ends up delivering many of Max's catchphrases, including "...And loving it" and inevitably "Sorry about that, Chief".