Visible crew/equipment: When Michael Fay (1st Vampire ground zero) enters the cabin to escape the police, the film crew can be seen through the porch railing at the bottom right of the screen. (00:40:53 - 00:49:47)
Continuity mistake: Captain Dobbins has her Garrison cover tucked under the belt of her uniform overcoat with her rank insignia not displayed. In the next shots, the USMC emblem is displayed on her Garrison cover and rank insignia is displayed again. (00:25:05)
Character mistake: At the police station when Damien Asante is reading the information on the computer about the hit and run, he says "On February 25, 2015 Christy Markus and her son were struck by a car. The driver kept going." If you look at the computer screen, the date of incident says February 25, 2018. (00:30:00)
Continuity mistake: When Will Parry visits his grandparents, the grandmother is sitting on the sofa next to Will's grandfather. The grandmother's position keeps changing from sitting right next to him to being further apart.
The Graveyard of What Might Be - S1-E2
Continuity mistake: Manx has his left hand on The Wraith's hood ornament as he speaks with Bing, but when the shot cuts to Manx handing the invitation to Bing, Manx's hand is not on the ornament.
Revealing mistake: The ghosts often cast shadows.
Suggested correction: You can also hear their footsteps. But I'm not sure this is a mistake, just their own perception. Within the ghostly world they appear and act just like they would in life.
The ghosts are manifestations of energy, therefore they have no physical body to block light. Even if in the ghostly world, physics are physics and there should be no shadows.
Plot hole: The episode's climax concerns Bernie rushing to the airlock to stop the rest of the crew, who are infected, from flushing themselves into space. Except that he's infected too, so they can't flush without him anyway.
Other mistake: A Mexican pilot based in Ensenada is interviewed. He owns a 1983 Cessna 172 aircraft. When they show it in the air, it is a 2005 Cessna 182 based in San Antonio per the FAA database. A US registry aircraft would not be based in Mexico, owned by a Mexican pilot. (00:11:20)
Continuity mistake: When Nick's mom tells him to show Gypsy around she takes the cigarette away from her lips. A shot later it's back in.
Welcome to Hotel del Luna - S1-E1
Continuity mistake: Man-wol takes out her sword and points it at the old lady. In a close-up of the sword, we can see it is pressed against the old lady's neck. But in the next shot, it is a few inches away from her neck. (00:05:22)
Factual error: An FBI briefer is talking about the hijacking of a passenger airliner. He calls it Flight 6175. The airplane has 6175 stenciled on the nose. Those are usually the last four digits of the airplane serial number, used by maintenance and dispatchers to designate a particular aircraft. It is not the flight number of any given trip. (00:04:45)
Most Likely to Go Your Way (And I'll Go Mine) - S1-E5
Continuity mistake: A group of people are standing before a door with full glass inserts. It has a thought processor for access. Once the group defeats the processor, they open the doors. But the doors are now solid wood, not with a glass insert. (00:29:20)
Continuity mistake: When Vincent is showing the delivery man his basement to show him the wooden cube isn't there, the delivery man's ID tag is positioned so that the front side is facing outwards. In the next shot, the ID tag has suddenly flipped around. (00:11:20)