(at about 26:33 mins) In the morning, Marc names "a stunt plane [might have crashed on them]" as a possible cause of death for Pico and Xavier. In Belgium, it is by law forbidden to fly any small plane as late in the evening as then. Since Pico and Xavier were last seen by Oscar and Pascale just before midnight the night before, it is impossible for them to die in a plane crash. This is merely black humour on Marc's behalf.
(at 10:15-10:30 mins) Boma drives too fast to just stop a few meters past where Dimitri is. He would have to stop it much farther. The car's brake distance is too short for the car to stop where it stops, at the speed at which Boma drives it.
(at 21:52-21:54 mins) The scene in which Pico and Xavier lay in the car at Dimitri's garage after a drunken night. About at the moment when they kiss their wives' pictures, a crew member is visible behind the car even though it is dark in Dimitri's garage. One has to look closely (left on the screen).