Revealing mistake: Throughout the film, the base station radio is not connected to an antenna. In many lengthy shots of the back of the radio we can see the power cord trailing out the back of the unit, but there is nothing plugged in to the antenna socket. This is especially annoying because base station radio problems are a key plot point.
Revealing mistake: The person slamming Blaire's laptop shut at the end is a male crew member.
Revealing mistake: When Viggo pushes the car off the edge and it hits the ground, as it rolls you can see that the engine/transmission, drive shift and tank have been removed. (01:26:00)
Revealing mistake: In the scene with the games console the controller isn't on and it is either not attached to a PS3 or the PS3 is off. You can tell because if the controller was on there would be a solid red light and even if it was just charging there would be a blinking red light.
Revealing mistake: When David Harbour is going to search his place, you see him check his weapon. The picture shows the rounds but all the primers have indentations, showing they've already been fired. (01:21:25)
Revealing mistake: When Alison is holding on to the Titus, Gary tries to save her, and they are seen dangling in the air by the tornado. In the shot of Trey looking out the bank window, you can faintly see wires attached to Alison to make her dangle in the air.
Revealing mistake: At the end of the movie, it's pouring rain but the 2 survivors aren't getting wet at all.
Revealing mistake: When Tom and Anna were jogging on a dirt path, the woman going in the opposite direction who passes them on the right would be walking straight into the kids (and woman) who were running past them on the left - but the woman on the right disappeared behind Tom's back where the collision would have occurred if she were really there. [Use of a green screen]. (00:29:25)
Revealing mistake: At the end the sides of the grave (which Jack just had dug by spade) are too perfect. Only an excavator could get such neat sides.
Revealing mistake: JR is in the weapon container of the crazy dealer, who passes him some of his goods. JR ends up holding in his right arm a MP5K and an M4A1, which combined are about 5 kilos, but then he passes him an M60 Machine Gun, which weighs over 10 kilos and that the relatively diminutive protagonist just handles throughout the scene gripping it with his left hand and making no effort whatsoever. (00:25:20)
Revealing mistake: After Fin, Martin, and the rest get what they need in the Times Square area, they get in the cab and drive off, and just as we hear on the news "Moments ago the water spout came ashore and devastated the UN," in this exterior shot we can see the taxi's back tire as it's driving down the street, but the tire's not actually moving. Presumably the taxi is on a flatbed being driven by crew while filming from this angle, hence the tire being stationary.
Revealing mistake: The room Jim and Neville are in is equipped with a double interior wrought iron security gate that appears to be automated, but it does not actually function like a motion-sensored one typically would. The double doors are open before Neville's bookkeeper exits, and where Neville is standing might explain why both sides of the gate are open and stay open until the bookkeeper re-enters. However, they close behind the bookkeeper (and at different rates), even though Neville has not moved. (00:09:26)
Revealing mistake: When Barney shouts at Christmas in the pickup to go right, there are already skid marks on the floor from a previous take. (00:20:05)