Revealing mistake: In the scene where the burned man attacks the prostitute (the first scene after he leaves the hospital) you can see him stab her with scissors, but when he takes them out we can see that they're missing tips for safety (they're too thick to have broken off inside her). (00:12:50)
Revealing mistake: In the raft scene where the garden shears end up hitting parts of the raft, there is one scene where the shears cut through one of the planks of wood. You can see that the plank gets cut too cleanly. No matter how sharp garden shears are or how fast they are being swung around, wood doesn't get cut this way. This plank has been pre-cut.