Continuity mistake: When the SWAT team arrives at the hive, the open an elevator shaft and one of them lights a flare with 2 hands. As the camera changes, he is now holding it at arm's length and with one hand without enough time to do so. (00:23:05)
Continuity mistake: When Rain tries the door on the train and fails, we see her face and her hair has 2 strands on one side of her face. Camera changes and now she's got 1 strand. (00:16:50)
Other mistake: In the beginning when Spence breaks the T-Virus vial, its fumes can be seen entering the ventilation system from holes on the wall. Shortly after though, when Dr. Blue, Dr. Brown and Dr. Green are trapped in the flooded room, the former of them claims it is "sealed." (00:03:05)
Audio problem: Near the middle. When Matt is searching through the office room where his sister Lisa worked, you can hear his shoes clicking as if he is on a hard surface floor, but the floor is covered in carpet throughout the office. (00:49:00)
Continuity mistake: When Alice and Matt run to meet up with Spencer, Kaplen, and Rain, Alice screams "Don't shoot!" and Spencer, Matt, and Alice try to close the door from the zombies. A zombie then grabs the inner part of Spencer's arm, then a shot moves showing the zombie holding onto Spencer's arm from the bottom, then back to the inner part. (00:55:45)
Audio problem: In one of the scenes right before the solider get killed by the lasers and the alarm is sounding, the commander says to everyone "Hold your positions, everyone stay calm" but his lips aren't moving. (00:31:20)
Audio problem: In Dining Room B, the team leader goes to look at the map and states, "Maybe you're reading it wrong." However, his mouth, which is visible for the word "wrong," doesn't move. (00:27:10)
Continuity mistake: When the lift malfunctions, the lady has her head and arm outside the lift when she starts screaming to pull her back inside. We get one shot of her again with her head and arm outside before the shot changes to the security camera angle, and in this shot only her head is sticking out from the doors, with no time for her to move her arm (which was stuck) back inside the lift car. (00:08:15)
Continuity mistake: When Spencer is looking through the desks, a zombie startles him by banging on the glass window. When the zombie does this, his left hand is high up on the glass. The shot changes, and now his hand is a lot lower on the glass and not entirely flush against the glass like it was previously. (00:48:00)
Continuity mistake: When Rain and JD are tasked with watching the prisoner in Dining Room B, Rain's hair on her right-hand side drops down and curls to the front. The camera changes and now it's curling to the back. (00:27:30)
Continuity mistake: Alice asks if Spence remembers anything from before it all kicked off. When she does, her hair is tucked behind her left ear. When the shot changes, however, it's no longer tucked neatly. (00:25:20)
Continuity mistake: The position of the shower curtain in relation to the floor tiles is massively different between shots. Note the tile pattern on the floor. (00:09:00)
Continuity mistake: When the lift malfunctions, we see a shot from the security camera showing the lift going up and the lady's head being near the top of the lift door. The camera then changes to a shot from above the lift door, and we see the lift moving towards the camera, but her head is now at the bottom of the lift door again. (00:08:15)
Continuity mistake: When the first laser passes through it hits the one guy in the wrist, however we see him on the floor missing half of his fingers and hand instead. (00:31:30)
Continuity mistake: In the laser corridor, the team leader is stood upright when the lights comes on, but as the camera changes to a front view, he is crouched. (00:30:10)
Suggested correction: It's easy to miss, but there is a quick insert-shot in-between these two shots that shows the team leader crouching down suddenly. (The camera is focused on the back of his head as he ducks down suddenly.) It can be seen in this video (https://www.youtube.com/watch?v=rOLe15-5Xhw&t=65s) around the 1-minute mark.
Continuity mistake: In the scene where Matt pulls Alice into the mansion at the beginning of the movie and the SWAT team comes through the windows, the main SWAT member pulls Alice aside and asks for her report. If you watch the scene Alice has one arm at her side and one across her chest. A split second later it shows her reflected in the eye lenses on the SWAT member's mask and Alice has her arms crossed in front of her. Another split second later they show Alice again and her arms are in the original position. (00:13:35)
