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: After Jake has seen Hawkins through the scope, he lowers it down to his hip in the long shot. Cut to a close-up of Jake, and he is suddenly holding the scope much higher, at shoulder height, without any time to move it back up between shots.
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: 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."