There Is No Other Way - S2-E16
Continuity mistake: In "Thank You So Much" Valentine's day was on a Saturday or Sunday. In this episode, They are showing Bree marking her chores off a calendar for February and March 2006. The calendar matches the real calendar and Valentine's day was a Tuesday this year. The calendar doesn't match their previous episode. And they do state that "today is Valentine's day." not that they are celebrating it on the weekend.
There Is No Other Way - S2-E16
Continuity mistake: When Susan reveals her feelings in the operating room, the face mask Dr Ron is wearing covers his nose and mouth in one shot, then not his nose in the next, then his nose and mouth again in the next. (00:38:30)
Chosen answer: Poker. They have been playing that this whole time, once a week with everyone who was invited that lived on the Lane.