When Gabrielle throws some salsa in John's face, it makes a mess, especially in the eye area. However in the next shot his face appears completely clean.
When Bree is out for dinner with George, the scene starts with a close up of her eating with her fork in her right hand. It then cuts to a wide shot of her suddenly holding her fork in her left hand, and then she switches it to her right hand.
Near the beginning when Susan is saying goodbye to her mother and spots Mike from across the street, the exact shot of Mike grabbing his mail was used in a previous episode (Season 1, Episode 19) for the same purpose.
When Morty gets down on his knee to propose to Sophie, the angle of the camera shows the top of the set, making it seem like there is no ceiling to the room.