When Chloe goes to see her mother using the communication stones (at around 40 mins), there is a shot with a piano, its ornate music stand is lying flat. In this particular shot it would have been a distraction had it been up. Moments later we see that piano (at around 20 mins) and the music stand has been mysteriously raised.
Eli has a drone he's using throughout the ship, but doesn't use it on the planet to cover more distance.
It is stated that "gypsum is calcium sulphate, which is 36% calcium carbonate" This is incorrect. Gypsum is just hydrated calcium sulphate and contains no calcium carbonate.