When Bree is at the restaurant by herself, she is wearing a ring around her neck on a chain which constantly moves position throughout the scene.
When Bree grabs the twin's toy keyboard, she grabs it and holds it at a downward angle. But in the immediate shot she is suddenly holding it at an upward angle.
When Mrs McCluskey knocks on the Vandecamps door to tell Andrew that Bree is sleeping in the yard, he walks out onto the porch to see his mom face down on the lawn, you can see the cover for the sprinklers open, and see the dial.. but when he tells her, he knows how to wake her up, you see him walk over to that same dial and open the door before turning them on, to wake Bree..
It is the weekend and Valentine's Day. We see in the following episode that it's 2006 and their calendar matches the real one, but Valentine's Day was on Tuesday that year.
The opera singer seen at the beginning at the episode is dubbed. His lip movements don't quite match the tune.