When Bones first flees from Bully, he drops his bag and Bully's goon picks it up. A few scenes later, when Bones is going out to salvage copper, he has his bag.
Bones tries to sell copper tubing he scrapped from a house to a scrap metal collector for $100. Copper only goes for about $2.00 a pound so he really wouldn't have gotten much more than that. However, Bones says to the collector, "There's about a hundred dollars worth in the bag!" He's not referring to the single pipe which he pulls out and hands to the collector; he's referring to the bag's entire contents. Given the size of the bag, and the amount he stuffed in there, it's conceivable that he has roughly 50 lbs. of scrap copper to sell.
When Bully is under water after the car wreck he is upside down. The heels of his feet are on the car's hood and his head is under water. Yet when he exhales the bubbles go down when they leave his mouth. They should rise.