When the lady in the bathroom calls because her tub is on fire, Maddie instructs her to thread a hose through her toilet. The toilet is on septic but the tub is on city water.
When Athena pulls the coffees for her kids out of the beverage carrier and sets them on the counter, they make a hollow sound. They're obviously empty props.
When Buck returns to his house, he's surprised to see Eddie (Buck thought Eddie flew back to El Paso). While Buck is standing near front door you can see a microphone dip into the shot on top.