Character mistake: In Season 5, Episode 4 ("The Heart Attack Boys"), Abishola twice gives Christina an injection without swabbing her skin with alcohol. Abishola is an RN and would never make that mistake.
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.
Continuity mistake: When Tabitha and Maggie are discussing the tiles, Tabitha's right hand is suddenly on Maggie's left shoulder as the scene cuts.
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.
Through the Valley of Shadows - S1-E2
Audio problem: After they discover the rogue planet that they can mine oxygen from, Niko tells Javier and Bernie to inspect the outside of the ship for damage. When the camera cuts to them, you can hear Javier respond in full with a sentence as the camera is focused on both of them, however their mouths aren't moving at all.
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)
Welcome to Hotel del Luna - S1-E1
Continuity mistake: Man-wol pours some stuff to drink into a bowl and then picks it up with her right hand. There is a bandage wrapped around her hand and some of the bandage can be seen dangling freely over her hand in the shot of her picking up the bowl. In the next shot, the piece of bandage dangling from her can't be seen. (00:03:15)
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.
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)