The title has a double meaning, referring both to Acting Dean Adiyodi struggling to run Brakebills, and Fogg-17 acting as though he's a recovered Fogg-40.
Margo mentions to Julia, that Josh's gone to his nephew's Bar Mitzvah. In Apocalypse? Now?! (2020), Josh mentions he wants to go the Bar Mitzvah, as soon as their plan of saving the world is done.
The greenhouse at Brakebills is Botany Bay. This is also the name of the bay forming Sydney harbor in Australia. Botany Bay was the first penal colony for convicts from the United Kingdom.
Fogg-17 gives himself away by referring to Todd as "Eliot", but he didn't confuse him with Eliot Waugh the High King, the student's first name IS Eliot, middle name Todd.