They have wandered away from Fremont street and have entered into a ghetto part where nobody will give you money. Las Vegas only bothers with cleaning up the money-making parts, the Strip and Fremont. Wander a block away in either direction, and you might as well be in a different 3rd world country.
IDK what Chris was thinking, asking a guy who's sitting on the dirty street, leaning against a light pole abd eating food out of his lap. Obviously homeless. I think Sam might have given the guy a little money, he was groping in his pockets and pulled out a couple dollars before the camera cut back to Chris.
