Equatorial Kundu is the same fictitious country that Aaron Sorkin used in The West Wing.
When Sloan and Don are talking towards the beginning of the episode, Sloan says that the New York Time crossword puzzles frequently have the wrong number of spaces for the correct answers. This could be considered a throwback to the West Wing's Leo McGarry, who was routinely in contact with the NY crossword puzzle editors over "mistakes" found in the puzzles.
The start of the last season was contracted by HBO which Sorkin stated he had no interest in doing. He finished in a minimum 6 episodes. Stating as well season 2 didn't go as he wanted because HBO wanted a more linear second season, this destroying his original plot of a comedy drama about people's lives.
Will mentions to Charlie that the two of them should quit and "do sports". One of Aaron Sorkin's early programs was Sports Night (1998) about a fictional sports television show.