The watermelon that Bree cuts into is clearly a seedless watermelon, yet the slices she cuts for herself and George have seeds in them, and the number and position of the seeds frequently changes between shots.
The position of Mrs. Mulberry's umbrella, after being run over by the garbage truck, changes between shots.
When we see Danielle standing with Bree in the kitchen, you can see a long wall behind Danielle without a passageway. But when the shot changes to Andrew and George, Danielle is standing in the background.
When Susan is telling Bree and Gabrielle about Zach, Gabrielle's wine glass has a small amount of wine at the bottom, but in the next shot is almost half full.