The location where Charlie saves Mac's life is outside Maclaren's, the fictional Irish bar from 'How I Met Your Mother.'
The Royal Diner in the background of the opening scene is the same Royal Diner frequently featured in the TV show Bones (2005), where the main characters often dine.
Charlie says, "if the shirt smells like shit, you must acquit," which is taken from a quote in the O.J. Simpson case, "if the glove doesn't fit, you must acquit."
The gang visiting an arbitrator is a callback to Season 10's "Charlie Work" episode in which many of the gang struggled with "the arbitration process" to decide who came up with their newest scheme.
Frank is whistling one of the shows soundtrack pieces in the opening shot, marking the first and only time (as of August 2018) a theme song has come from inside the world of the show (not being played as background music).