The color of the front door changes from maroon from when they first move in to white when she leaves to go to the market for the first time.
At around 29 minutes when Rial is getting her blood drawn, the woman drawing her blood fills a purple top tube while the yellow top is clearly shown to be empty. When drawing blood, however, the purple top (EDTA) tube is always drawn last after all other tubes to avoid cross contamination of tube additives.