Bree comes home from buying a new Lexus LS 600h to show it off to the other women, but she can be seen driving it several episodes earlier.
When Bree is about to show how her new car can park itself to her friends. The camera crew's reflection can be seen on the car. (Because of how shiny the car is)
Bree brags about how the car's rear-seat refrigerator is "just the right size for a split of champagne and two chilled glasses", yet she has been a recovering alcoholic for several seasons now.