When Preston is being chased throughout the park, he rides his bike down a flight of stairs. When he reaches the bottom of the stairs, he falls off the bike, causing him to lose his backpack full of money. The camera shot zoomed into the bag being seen on the ground with a background of mostly trees. A few minutes later, it shows him riding his bike through and open area in the park where a man looks to the ground to pickup the very same backpack he lost in the woods. Unless this backpack has supernatural powers to move itself, I don't see how this is possible.