Around 00:20:40, we can see with Gertrud's coat that the wind is going from left to right. On shots from behind her, the wind is going on the other way.
The airplane scene relies on the false assumption that passenger oxygen masks are fed from some kind of centralized oxygen tank. In reality, every passenger mask is fed by its own chemical generator (not tank) and the scenario, as depicted, is impossible. Only masks intended for pilots use the oxygen tank.
Around 00:49:43, Saga's scar is on the left side of her mouth cause the frame is reversed.