In episode 1.6 Tricks of the Trade (2011), Mike tells Rachel that the LSATs only come four times a year, with the next one coming in three months. Since Rachel takes the LSATs again in this episode, at least three months have passed in the universe since that episode.
The title "Meet the New Boss" is a play on both the arrival of Daniel Hardman (David Costabile) and the song "Won't get fooled again" by The Who. The song lyrics are also spoken in dialogue by Margo Martindale's character.