Stanley gets hit in the face and there's a shot of him lying on the ground with a bloody eye. Then moments later, they show him again, but it's the other eye that's bloody.
In the final scenes, the blood on the boys hand shifts from left to right and back to left again.
When 'The Man' is giving Stan advice on how to pick the lock he mentions "pins", and Stan is using two tools to pick the lock. However, it is a warded lock, a type that contains no pins and is picked with a single tool.