Hudson University is a location used in DC Comics, most notably as the college attended by Dick (Robin/Nightwing) Grayson. In the comics, Hudson is said to be in the town of Rutland, Vermont.
Constantine's bulldog-headed cane shows up again (and it's confirmed that it really does talk to people).
Dionysus is the god of the grape-harvest, winemaking and wine, fertility, ritual madness, religious ecstasy, festivity, and theatre in ancient Greek religion and myth. Those who partake of Dionysus's mysteries are believed to become possessed and empowered by the god himself.
In English, the sorority letters for "Delta Chi Sigma," spell DCS, as in DC's, part of the name of the television show DC's Legends of Tomorrow.