OK, for this slip up, you have to go forward into the movie then back then forward again. First, when the group is at Hoover Dam, Katherine said that they may get some electricity soon. Then go back to where Ellen and Katherine are in the kitchen. When Ellen grabs something out of the refrigerator, you see a light coming out. That means there has to be electricity. When they are outside about to leave, you see a satellite dish on top of there mobile home. And last, when Clark and Eddy are out digging for cash, you can notice a porch light on outside of the mobile home.They did pretty good for having no electricity.