During the disastrous trip down the mountain side in the cable cars, the one on the outside track is detached, and crashes to the ground. When the surviving car reaches the lower terminus station, it is riding on the outside rail.
In the platform inside the volcano, when it starts to erupt, people start to die randomly (falling on the floor, etc) without getting hit by debris or smoke bursts. Even when they take the elevator, when it falls, there are dead people in there, while earlier, it showed every person in there alive.
After the occupants of the crashed cable car are freed, they all get in the orange land rover. The older man, wearing a blue jacket, enters the driver's door, but the younger man in the pink shirt is the one that drives away, whilst the older one sits in the back seat.
When Jason's character puts the little girl on the boat with the other refugees, you can see that there is two 150 horsepower engines on the back of the boat. The boat pulls away like a slow boat to China whereas it could have taken off like a rocket.