When Anne undresses Lou after bringing him home to treat his injuries, his chest and armpits are heavily hairy, but in the ending scene the armpits appear to be less hairy and the chest is shaved clean-cut.
As Joseph find the Dead Bodys in the forests, he squats next to the cuffed female Corpse, you can clearly see that she is breathing.
When Anne begins to drag the man towards her house on the makeshift sled he is facing towards her house, but once she opens the door to her house he is facing away from her house.
Mersault mentions several times that Renee should take her rifle, which he calls "the .22" though the rifle is obviously a .30 caliber or larger when seen from the front.
The lever action rifle that the girl and her mother used that was referred to repeatedly as being .22 caliber is actually a large caliber rifle and not a .22. Lever action .22 caliber rifles do not load through a side loading gate, are much smaller than the rifle in question and simply looking at the large bore at the end of the barrel makes it clear that it's a large caliber rifle.
When Danny is confirming the registration number of the vehicle he says 'Orion' 'Hotel' 'Foxtrot.' This is NATO phonetic terminology which is used by the police and whilst the last 2 words he uses are correct he incorrectly uses the word 'Orion' - the NATO phonetic word for the letter O is Oscar which a police officer such as himself should know.