Continuity mistake: When Deep Dark Secret breaks the jar to free the emotions, look at where the emotions are standing, and how the huge piece of glass lands behind them. In about three seconds, the piece of glass changes position, and some of the emotions switch places. (00:33:08)
Continuity mistake: When Jessica kills the sniper with the rock at the beginning, the sniper's body is lying dead on the ridge. When she shuffles down the dune to speak to Paul, mere seconds later, the sniper's body is no longer there. (00:09:04)
Continuity mistake: In the woods, Julia talks about the spider-guy, and Cassie touches her nose in disbelief, then lowers it to chest level. From the immediate opposite angle, her hand is raised close to her head. (00:50:50)
Continuity mistake: After the Virgil quote scene and the fight that follows, Lucius takes a bath. There's a close-up of him saying something about dying in the arena, and his hair is suddenly better brushed and drier. Then it goes back to the previous wet hairstyle.
Continuity mistake: After the car makes a U-turn, Callie's arm is not resting on the seat. A shot later, it is. (00:05:51)
Continuity mistake: When Marcus is in the car, his grip on the phone changes between shots: sometimes he holds it with all his hand, but at other times just with his thumb and index finger. (00:14:58)
Continuity mistake: In the staff room of the toy store, Callum gives Jack his Monopoly box to hold. The box does a 180° spin between shots, twice.
Continuity mistake: When Eddie and Martin meet for the first time in the woods and they are having a conversation, Rhys Ifans wears his necklace with the pendant above his clothes in the majority of the shots, except the ones when the camera is focused on Tom Hardy and he is facing left. In those shots, the pendant is under the T-shirt.
Continuity mistake: Several times throughout the movie, Thelma's eyes appear to change colour.
Continuity mistake: GUN was formed during the events of Sonic the Hedgehog 2. In the Knuckles series, the Buyer stated that GNU had existed long ago, under a different name. However, in the flashback in Sonic 3, the door of the laboratory that Shadow was in has the GUN logo.