Synchronicity is a song by The Police, Constantine is based on Stings look from his performance in Brimstone & Treacle (1982). Synchronicity is also is how John Constantine travels, he moves from place to place, and finds himself on airplanes or trains traveling to his destination. His very first appearance was in the comic of Alan Moore's retelling of Swamp Thing in his second go round in the comics.
Newcastle was always a sore spot in any story or action that Constantine was involved in, the phrase " John, not Newcastle all over again!?" This premiere explains Newcastle which is always a thorn in Constantine side.
Jes Macallan (Ava Sharpe) and Phil Klemmer, Executive Producer also speak of the upcoming seasons and the crossover links due to magic, Constantine's forte.