The professor and the young black man steal a red car by hotwiring it. Then after crossing the dangerous bridge, the young man turns the car off with the keys. Why would he hotwire the car if they have the keys.
After the animal attacks the car, all the damage has vanished.
When you see the stolen car in the wing mirror reflection, it has gone from a two-door red car to a four-door black car.
When Molly and Jason steal the red car, there's no rear plate. But after the hippopotamus scene, the plate appears and then disappears again.
There is no such thing as 12.7 on the Richter scale. The scale is exponential and 10 is estimated as enough energy to break continent at a place where there is no fault. The San Andreas fault is estimated to have the energy to generate an 8.3 quake.
Upon finding a dead worker in the underground utility tunnel, Molly picks up a corroded coin and says it is due to hydrogen sulfide (H2S). H2S has a strong unmistakable odor of rotten eggs and would have been detected prior to reaching the worker. Also, H2S is heavier than air; unless the worker was lying face down on the floor, the H2S would have had to already accumulated at least a couple feet deep to overcome the worker. That being the case, Molly would never have smelled fresh air coming down from above due to it being lighter than H2S. Nick and Molly crawling through the tunnel blockage would have been impossible as they would have died almost instantaneously due to complete lack of oxygen.
Spelling mistake in the news ticker announces "manditory" evacuation instead of mandatory.
A dozen 1.0 earthquakes in a day on such an active quake region as the San Andreas Fault is very common and not necessarily a sign that a bigger one will come.
A plane crashes into the grounded chopper just behind some characters, but they are unaffected.
In the beginning helicopter shot was shown with cracked windshield, how can helicopter allowed to fly with cracked glass.
After stealing the red car, in the next driving scene, it starts with a view of the wing mirror. In the reflection, you can see the car is black.
In the helicopter scene, the crew and equipment are reflected in the pilot's sunglasses.
When the giraffe runs across screen, it is clearly in a golden grass savannah on a bright sunny day. Contrast that to the muddy trail going through the wooded area in which they just encountered the hippos.
Several characters were taking the elevator up from the main level, but when the quake causes the elevator to plummet, they are plunged down to the basement. The run to the room for medication has Ali run down several flights of stairs to retrieve it. When they run to safety, they are again walking down the stairs into the grand entryway of the hotel. Interesting feat, seeing as the elevator is supposed to be at the bottom of the elevator shaft.