In the archive footage, the ten year old Michèle has bright blue eyes. The eyes of the adult Michèle are greenish brown.
After her car crashed against trees, her cell phone and bag remained unmoved in the seat at her side. The airbag deployed indicating the crash was not light, and her objects must be fallen.
After the crash, the gear shift lever of Michèle's car is in the "Park" position.
At the gun range, before firing the .44-revolver, Michèle fails to put her earmuffs back on. Yet after the shot, her hearing is not affected.
The number plate of Richard's car when he parks outside Michele's house is different from when she looks out of the window at his car. The same number plate is seen near the end of the film on Vincent's car.
At the firing range, Michèle grossly mishandles the gun, pointing the loaded weapon directly at Kevin standing next to her. She then fires the gun while neither of them are wearing hearing protection.
At the Christmas Eve house party, one of the guests asks to watch midnight mass on the TV. The TVs shoes Pope Francis celebrating mass from St Peter's in Rome. There is never such a midnight mass. The Christmas vigil mass it tends to be at 7 or 8 pm in the evening.