Continuity mistake: When the decision to open the gates to let everyone in is made, the countdown is at 15 minutes. When the gate is fully lowered and people start running in, the timer is at 4 minutes. How can they get all the thousands of people on and raise the gates in 4 minutes? It took 11 minutes to go down and 30 seconds to get back up.
Continuity mistake: When the RV camper van lands after its jump on the runway, you can see the steering gear and passenger front wheel has collapsed. In the next shot when Jackson enters the camper to retrieve the map, you can see the wheel is fine, and then its damaged again in the next long shot.
Continuity mistake: Right before the scene where the earthquake happens at the supermarket, we see the crack moving through the parking lot. The cars are parked parallel to the store. We see car after car shake, etc, until it gets close to the front door of the store. After the earthquake, when the news is on the TV, it shows the store after the crack has gone all the way through. The parking spaces and cars are facing a completely different direction.
Continuity mistake: When the door opens on the ark to let the mass of people in, there is a large yellow arm that starts to close in on Jackson and his family. The tunnel that his son is pushed into last minute had a large metal door open on it that instantly disappears like it was never there when the arm passes the opening.
Continuity mistake: When Jackson picks up his kids to go camping, we see nothing on the sidewalk grass field in front of their house. But when he returns home to drop the kids off, we now see that there is actually a pedestal displaying the address of the house, we can also see this pedestal when the earthquake hits.