When Ivy is complaining about her Liaisons co-star to Tom, she remarks that he's turning the whole show into Spamalot. Christian Borle, who plays Tom, originated multiple roles in the original Broadway production of Spamalot to much critical acclaim.
When Tom and Julia are in Jerry's office, the poster behind them is for Spring Awakening. Andy Mientus (Kyle) has starred in three productions of the show.