When Jenny and Beau approach the old green farmhouse, looking for Joe Walker, during one shot where you see the two characters from behind, you can tell the female who is supposed to be Jenny is a stand-in. She's wearing different pants (more similar to Capri's as opposed to the dark jeans that she was wearing when she got out of the truck,) different shoes (tennis shoes as opposed to black boots,) and her hair is clearly longer and lighter in color.