Buckley's hair changes from red to black several times during the final scene.
About halfway through, Hank sees Buckley out on his lawn and goes to investigate. Hank opens the sliding glass door, and we see the kitchen behind him. Then when we can see Peggy behind Hank, the glass door is closed and now the living room is behind them. Hank then goes back inside and closes the glass door and now Him and Peggy are in the living room instead of the kitchen.