Continuity mistake: When Hannah is tending to Trevor and Sean as guests in her house, she brings three mugs over and places them on the table. Between shots the three mugs swap their places; you can easily see this by comparing them in relation to the book sitting next to them. (00:15:20)
Revealing mistake: After Trevor has been lowered above the pit of magma, in an attempt to light the magnesium walls with a flare, we see shots of Sean hanging over the edge of the inside of the T-Rex skull. Sean's hands are resting on a large tooth in the skull, which clearly shakes like a fake prop each time he touches it. (01:17:15)
Continuity mistake: When Sean is jumping across the floating magnetic rocks, as he jumps on the one that begins to flip him around twice, as he is flipped round the first time, it causes his small black utility belt (with the pocketknife and phone pouch) to fall off his waist, down into the abyss. In the following scenes moments later though, the same pouch/belt can be seen on his waist. (01:05:15)
Continuity mistake: The sweat stains on the front of their shirts keep changing throughout the movie.
Continuity mistake: After Trevor and the others are submerged in the water they have soaked everything, but the book is intact and dry moments after that.
Character mistake: Trevor tells Sean to "eat his trilobite to keep his strength up." However, Trevor, a geologist, pronounces trilobite incorrectly as "TRIL-o-byt" instead of the correct pronunciation "TRY-luh-byt." The name derives from the fact that the creatures have 3 (tri) lobes. Tri - for 3 not Tril - for 3.
Continuity mistake: Trevor is saved from falling down a cliff and sees a sign covered in dust. He gives it to Hannah and in the close-up most of the dust is gone.
Continuity mistake: The Italian farmer runs fast to see the crash. When the angle changes he's moved several meters behind where he was standing, and is now walking.
Continuity mistake: While crashing against the vineyards, the amount of grapes stain on all of the 3 guys' faces is not continuous between shots. It appears/disappears randomly.
Continuity mistake: After exiting the volcano, the group starts to fall down and they all shout in desperation. Then it cuts to a close-up where the cry is faintly heard, but none of them are shouting.
Continuity mistake: When the kid gives the diamond to the Italian man, the way the farmer holds it differs between shots.
Continuity mistake: After Trevor is saved from falling down a cliff, the way Hannah holds the No entry sign differs between shots.
Continuity mistake: Trevor arrives at the lab and Leonard has made a popsicle. The amount of ice on it increases or decreases randomly between shots.
Continuity mistake: After having flown up the volcano, and they start falling, while still lying in the T-Rex jaw, they should have been weightless, but they still lie down.
Continuity mistake: The black hose next to Leonard swaps from stiff to bent down between shots.
Continuity mistake: During the scene when Trevor comes home and listens to the messages on his answering machine, there are 4 messages from Sean's Mom. As Trevor is running around trying to clean up, he's listening to the messages. Only 3 messages are played and when the phone rings it says there are 0 messages.
Continuity mistake: When Trevor and Sean are getting in the mini cart you can see the cart tracks along the side of the mini cart, but in the next shot the tracks change sides.
Continuity mistake: During the scene where Trevor is told that the funds for research have ended, he crosses his arms, then the angle changes and the arms are at rest and he crosses them again.
Other mistake: Max was killed in the beginning falling down a crack in the earth into hot lava, but then later they find his bones and bury him.
Continuity mistake: When Trevor brushes his teeth, the towel on the left changes the way it's wrinkled between shots.
Answer: A mountain.