At its final destination in Norway, the boat anchors and they have to take a tender to shore. The explanation being that the water is too shallow. But Norwegian fjords have steep sides so are very deep even close to the shore. For the same reason, dropping anchor would not have been practical as the water would have been too deep where the boat was.
When Kiera is under water in the pool it's impossible to shout under water let alone to shout repeatedly.
At the end of the film, when Lo is scrolling through her Guardian article, the same paragraph is repeated twice and the article is full of typos ("Norweigan", "accute", "lyphoblastic" etc.). Also, the doctor's name under his photography is spelled "Metha" instead of "Mehta".
At about 1:24:45 and on, the published story onscreen contains at least half a dozen grammatical errors, including the misuse of "it's/its" four times.
During the fireworks, the sound of the explosion is at the same time as the visual explosion. The sound should have a delay of at least a couple of seconds since sound travels a lost slower than light.
At 16 m 12 sec when Lo is about to enter Anne's room for their first meeting the boom mic is visible at the top of the screen after climbing to the top of the stairs.