During the opening flashback showing Quinlan as an ancient gladiator, the metal helmet he drops to the ground while preparing for the fight is the same one worn by Russell Crowe's character in Gladiator (2000).
At 21:20 Coco and Palmer are in a helicopter. Its registration is C-GTMI. Aircraft in Canada (where the series is filmed) all have registrations beginning with C. Aircraft registered in the US (the setting for the show) are identified with an initial N.
Setrakian refers to the vampires as "strigoi". As a Jew he would know that the second syllable "goi" is pronounced exactly like "goy" which is what Jews call a non-Jew or gentile.