Around the island there are shipwrecks. The shipwrecks are old enough that they should have broken apart, or at least all the canvas should have rotted away.
NPCs that are welding are using blow torches. They seem to be arc welding, but blow torches are incapable of arc welding.
Lara's watch reads the exact same time throughout the game.
Mr. Roth tells Ms. Croft to keep her radio on. This would leave the battery constantly draining; it would be much more practical to have radio checks at certain intervals.
Sources of light such as candles and lanterns are lit across the island, and no one questions why.
There should not be a replica theatre mask on an island in the Sea of Japan.
Lara uses the American word "elevator". If she was born and raised in the United Kingdom, then she should be saying "lift".
Lara, who is English, uses the American pronunciation of the word "buoy" (boo-ee), whereas the correct English pronunciation is "boy".
One of the team pulls back the slide on his automatic pistol. Since this was seen previously, the effect that this would have would be to eject one round of valuable ammunition.