Lana makes a comment to the barman about being "hand twins". This is a nod to The One in Vegas: Part 2 (1999), where Joey finds his identical hand twin. Aisha Tyler's character in Friends, Charlie Weaver, dated Joey briefly.
Early in "Shots" Mallory -during a staff meeting in her office -lets loose with only the second (to this reviewer's count) F-bomb in the series, the first being issued, more than a few seasons ago, by Slater, after Archer (of course) does something stupid.