Continuity mistake: In the treehouse, the contraption Henry built releases icing in a pile onto the top of the cupcake (or brownie) Peter is holding. When Peter moves the cupcake to his mouth, the icing is evenly spread in the middle. (00:07:04)
Continuity mistake: At the grocery store, Peter places a bunch of bananas onto the left-hand side corner of the conveyor belt. When the camera redirects shortly and returns, the bananas are on the opposite side. Similarly, the bag of lettuce Susan was about to place onto the conveyor belt is not there. (00:23:31)
Continuity mistake: Driveways are to the right of the houses (on screen). Susan is parking on the left side of her house, apparently in her front yard (covered in leaves so the grass is not obvious). This puts her closer to Glenn's house and facilitates conversations and interactions. Unloading groceries, Susan's car suddenly becomes closer to Glenn's house when talking to Christina. Shots from Glenn's house show the car closer to Susan's house and shots from Susan's house show the car closer to Glenn's house. (00:24:55)
Continuity mistake: In the hospital, Henry has a laptop on his lap when his mother throws his financial papers off the bed. Susan quickly picks up the papers and when she turns around and reaches across Henry's bed to put the papers on the tray, the laptop is gone. (00:47:40 - 00:48:23)
Continuity mistake: Peter is sitting on his bed when he notices Henry's red notebook (or diary) sticking almost the whole way out of a cardboard box on top of the dresser. When Peter goes to pick up the book, there is a side view of the box - the book isn't there, and he has to put his whole hand inside of the box in order to reach it. If Peter was able to see the book while sitting on his bed, the book should have been visible when he was standing next to the box, but it wasn't. (00:59:42)
