Character mistake: Selena Gomez drives into town in a fully restored 1967 Pontiac Le Mans, which is a long box shaped car. However, when confronted with Bill Murray and Adam Driver, Adam Driver complements her on her 1968 Pontiac Le Mans, which is a completely redesigned shorter curved body style. The two look nothing alike.
Continuity mistake: The three kids in juvi are looking at the zombie horde press against the windows. Geronimo through the first phase (until the guard cries out "Save me!") has his hands off the top of the seat when viewed from behind, while his right hand is holding to it in front views. (01:06:15)
Factual error: Bobby's shotgun hit blasts a hole through the head of the first zombie entering the store, but the zombie directly behind it, as well as the barricade, are unscathed. The shells can hardly penetrate this much, wide and clean through the head and then disappear with no trace. (01:35:05)
Continuity mistake: At the police station, Ronnie gets up and switches the table lamp off when Mindy stands. Wrong continuity at the cut, though. Adam Driver still has the hand on the lamp, but his other hand is suddenly on the back of his own chair (it wasn't before), and Chloe Sevigny suddenly has her jacket in her right hand which was on the back of her chair. (00:20:55)
Continuity mistake: A couple times during the trip before stopping for gas as "The dead don't die" plays on the radio, Jack's arm moves from the top of the window to the bottom between shots (when the song goes "For the lights to shine down on" and when Zack passes him the energy drink). (00:39:15 - 00:39:50)