Continuity mistake: Episode 1-14, "Heart of Winter". Just before the robbery, Jake throws some water bottles and a flashlight over a small mound into the bushes, to hide them from the thieves. But when Mimi later picks them up, they are much closer to the truck, and on the other side of the mound. In fact, the bottles and flashlight would have been in plain sight for the robbers where she picks them up.
Continuity mistake: In the beginning of the episode when Eric and Jake are riding in the car, Jake asks Eric if the shotgun is loaded, and he says yes. The gun in pointed up towards the roof of the car. The shot changes and the gun is gone, then switches back and it's back on Eric's lap.
Continuity mistake: Episode 1-14, "Heart of Winter". After the robbers has taken the supplies from the overturned truck, there are several shots of Jake lying on the ground. In these shots the hood of his sweatshirt keeps changing position on his head, even if he is not moving. In the long shot where the black truck takes off, the hood has even gone from his head completely, and all of his hair is exposed. In the next close-up, the hood is pulled up again.
Audio problem: When Hawkins asks Jake if he needs help putting out the third fire, he uses his hand to stop Jake from opening the car door a couple of times. The first time he does this, the thump of his hand is heard a split second before his hand connects with the door.
Continuity mistake: Episode 1.13, "Black Jack". When the truck smashes through the building to escape Black Jack Fairground, a big part of the roof falls down over the car that is following directly behind the truck. As the angle changes, there is suddenly no sign of the fallen roof, neither on the car, inside the building or on the ground next to it.
Continuity mistake: When Gray and Jimmy are questioning the Hawkins family, Jimmy is wearing his brown uniform jacket. But in the scene where Gray is asking if Jimmy can search the house, Jimmy's jacket disappears for an instant, just after Gray has said "Just a question of being thorough". Allison Hawkins makes a remark about this being Kansas, not Soviet Russia, and as the camera comes back to Jimmy, his jacket is back on.
Factual error: In the beginning of the episode, Hawkins' boss tells Hawkins the attacks will occur at 8.05am. Then a shot of children playing in daylight is shown, followed by the text "33 hours before the bombs" and a shot of the city hall in daylight. 33 hours before the bombs would be 11pm.
Other mistake: The T.V. begins to work and you see a Chinese man with a map of the United States behind him. The cities that were destroyed were bulls-eyed on the map. Wichita was not bulls-eyed on the map, but Emily seconds later is crying in a car saying that her fiancee is dead because Wichita had been hit and she "saw it on the map."