Plot hole: When Qiu is leaving Emilien, she ties him to a chair, sitting on a raised platform. This is to make it possible for the big ball to hit Emilien. But, when Daniel arrives, Emilien is able to throw himself into the trunk, which means, that if Daniel didn't show up, Emilien could have just thrown himself to the floor instead. So if he would be off the raised platform, he would never have been hit by the big ball in the first place.
Continuity mistake: When Gibert is reprimanding the police, you can see a clock in background. It reads 11:55, but when the scene ends, the clock still reads 11:55. The scene lasts at least three minutes and the clock didn't move. (00:29:20 - 00:31:50)
Continuity mistake: When Daniel goes to meet Lilly, he puts pregnancy test behind his ear. The pregnancy test changes its position in the following scene. (00:38:35)
Factual error: The movie depicts Tignes-Val-d'Isère as the closest ski resort from Switzerland. This is actually not the case as if you cross the border here, you end up in Italy, over 60 km away from Switzerland. The closest ski resort from Switzerland in France is actually Chamonix.