Continuity mistake: One moment Frankie takes out two shot glasses and a bottle and starts to pour. She pours maybe one-fourth of one glass. The very next shot, both glasses are filled. (00:03:35)
Factual error: When Judy gets home and the key isn't working she looks at her iPhone and sees a long list of calls to Steve's mobile phone. This is wrong. IPhone just shows the name once per day and the number of calls in between brackets.
Episode #1.1 - S1-E1
Continuity mistake: As Ricky Gervais walks by the school where his nephew is, a "chubby little ginger" shouts "pedo" at him. He stops and holds one of the bars of the railing, third from the pillar. In the close-up, you can count more bars than that, showing he is in a different position altogether. (00:07:00)
A Single Piece Was Lost - S1-E10
Visible crew/equipment: When the Gruenaks attack the Scientist a puppeteer is visible to the right of one of the Gruenaks, just before it grabs the bird cage and throws it onto the Scientist's head. (00:28:18)
Plot hole: The captain's wife tells him that she's taking his daughter with her, not giving him a chance to even say goodbye. During the episode it turns out that she's angry because he missed lunch with them, and when the Metal Wu texts the boss, it also turns out that all this just happens at 1:11 AM! It does not make much sense: she waited over 12 hours to complain to her husband, and she's driving her kid in the middle of the night.
Character mistake: When Harlan Edwards collapses and Dr. Arcane tells them to clear his airway, one of the other doctors addresses her as "Dr. Cane."
Revealing mistake: When The Wraith is parked at the convenience store, wet tire prints are seen on the concrete from previous takes of the car backing up and turning off the store's lot. This is confirmed later as Charlie Manx actually reverses the car when he drives off the lot.
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.
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)
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)
Character mistake: Shaun says that the underground facility is "built like a bunker", but the single missile they dodged just created a huge hole a moment earlier. (00:11:40)
Chaos Is the New Cocaine - S1-E3
Continuity mistake: Alex opens a bottle of wine. She takes the cork off the corkscrew with both hands and the bottle of wine spins from not showing the label to showing it. (00:37:55)
Factual error: When Detective Superintendent Fulcher takes the oath in the first trial he ends with "So help me God." This phrase is not used in British courts.
Picture's Up - S1-E5
Continuity mistake: When the detective goes to retrieve the water bottle that Zach discards into the recycle bin, he picks it up with a napkin by the top. In the next shot, he is placing the bottle in a plastic bag top first, holding the bottle with the napkin by the bottom. (00:42:00)
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: The mayor Bobby and Keri are talking in a restaurant. Flashback 5 years - the same man sits at two different tables in two different sequences. (00:13:35)
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.
Continuity mistake: Detective Hoffman is in Grey's bar when Grey serves him a drink with a cherry on a skewer. The cherry alternates between being down in the drink or up leaning on the rim of the glass.
Chapter Four: Housechilling Party - S1-E4
Revealing mistake: When Ryan's iPhone vibrates with a text message from his mom, the text message is timed 5 hours before the time on the lock screen. An immediate message would normally indicate the time received as "now." (00:06:45)
Other mistake: The extent to which the classmates wrapped Miles in cellophane with his hands folded in front of his groin would make it difficult, if not impossible, for Miles to get out of the lake alive on his own. Miles did not drown... or suffer any injuries.