The placement of Jane's hands on his face when guessing Cho's gift changes between fingertips covering the eyes and palms covering the eyes.
There is no such thing as a Peruvian finger cuff. It's a a Chinese finger trap.
There is no way the body was washed down river, without a mark on it and then woven into the middle of a nest of branches like that.
If it had been carried by water and miraculously managed to wind it's way through all the other obstacles to get to the trees, it would have been stopped by the trunks and the high sides of the bowl of branches he was found in.
Jane's fast talking after the boy says "screw the police" is total nonsense.
Contempt for the police would be a perfectly tenable position for a criminal of any size.
Being public services found in most countries doesn't make the police force and the public transport service comparable.
And since the phrase is a watered down, more child friendly, version of the NWA song the sentiment expressed is anger at racial injustices and public transport used to be segregated, it would make perfect sense to say "screw the public transport system".