plotholes don'te exist in imaginary scenarios
People of the movie forum tend to post threads about plot hole. Well, in this movie, all happened were just Marie's imaginary killings in her web dream, none of them were killed after she woke up from the masturbation, since from the beginning she told Alex she always had weird dream(a rêve super bizarre), so this was just one of the weird/wet dreams.
When I have dreams sometimes, things tend to be illogical and ambiguous compared to reality, if I find plot holes in my dreams, it would totally ruin the fun for being part of the dreams.
Enjoying the movie, it is not about reality, why so picky? Why so serious?