Did no one else notice the hotel at the end is the same set used for the movie Motel Hell? Go look that's it! It's the same set more than likely the same area as well.
Both Kane and Able's heads are bashed in until they die, but at the end we see one of them limping up to the motel with some stuff wrong with his face, but they were both dead due to head trauma - there was nothing wrong with their legs.
After the sisters and the boyfriend get back to the motel with the cop. Gloria is wearing a red shirt, then when she brings them in coffee she has a tan shirt on, then two minutes later they are leaving and her red shirt is back on again.