In the hospital after talking to Rex, Bree puts her purse on her right shoulder. In the next shot, she puts it on her left shoulder.
When Bree is talking to Mike in hospital, the position of her roll neck jumper on her right shoulder changes constantly throughout the scene. In some shots it's rolled down, in some it is rolled up.
When Susan suspects someone might be in the house, the seduction music she has put on for Mike is drowned out by the score. When she accidentally hits Mike across the face, the score stops, but the music that was playing in the background has gone. The song in the background before now was music within the show, and it was loud enough to be heard around the house, so we should still be able to hear it.
When Gabrielle is pushing her couch filled with items down the street, you can see the feet/shadow of someone on the other side of the couch helping push.