During the first night after the abduction of their son, when the Hugues are back in their hotel room, we can clearly hear a US or UK police car siren (sine-wave tone). French police car sirens have 2 intermittent tones: D-A (police) or D-B (gendarmerie).
The person commenting the football match on TV has a clear Quebec accent, which is almost impossible on national tv broadcasts in France.