Pete Campbell's stumble down the office stair was in the finished script, and was executed through "twenty or thirty takes" according to Vincent Kartheiser.
In Detroit, Don asks Ted Chaough "Hey, Lieutenant, want to get into some trouble?" This is the same question Private Dinkins put to Don in Hawaii in the season's first episode. Each happens with a sleepless Don in a bar, each is an invite to help shepherd a risky marriage of one sort or another, and each time a war - of one sort or another - is the catalyst.
This episode takes place on and around May 12, 1968, Mother's Day.
The closing theme (as Peggy types the release) is a semi-original composition: a fusion of "Autumn Leaves" by Cannonball Adderley (1958, with Miles Davis ) and "Tropicando" by Les Baxter & 101 Strings Orchestra (1970).
When Pete is arguing with Tom Vogel, he says, "If I have such low character, why would you push me this way?" This is similar to what Don says to Pete when Pete is threatening to expose Don's true identity of Dick Whitman in Season 1.