Continuity mistake: When everyone is getting ready to leave the oil drilling base, Dennis Quaid is standing at the rear hatchway of the plane wearing his leather jacket, the camera view changes to a view of behind him, and he's not wearing it, he's in a yellow shirt, when the view goes back to the front, he has the jacket on again.
Continuity mistake: When the C-119 is crashing it loses its rear ramp and the wind howls through the cabin. A moment later when it has crashed it is all quiet inside, despite a storm of supposedly 70 mph winds being able to blow into this gap. Next scene, the aircraft is totally buried in sand but none has entered through the wide open ramp. Next scene after that (and all subsequent ones showing the rear of the aircraft), we are again shown that the ramp is missing.
Continuity mistake: Just as the Phoenix starts to move for take-off, there is a shot showing high dunes in the plane's path. However, in the shot as they are approaching the canyon the terrain in front of the plane is relatively flat (except for the canyon), no dunes in sight; they did not pass them.
Continuity mistake: What happened to all the camels and horses when they have a shoot-out with the nomads? We only see one nomad charging away on a horse, but there were at least 2 camels and 2 horses at the nomad's camp. The camels in particular would have been very useful when stranded in the desert, and then the survivors wouldn't have had to continue to rebuild the plane.
Continuity mistake: When Captain Towns has gone looking for Liddel (he ends up at the arch where the plane first hit), he shouts "Liddel.". There is a shot of Liddel looking to the right. In the background over his left shoulder you can see two of the crosses (makeshift gravemarkers) that are back where the plane and crew are, not where they are at. The editing is a little choppy too.