When Evelyn is talking to Jake on the couch, his knees are [at first] bent backwards indicating he is sitting on his feet. Once the camera angle switches, however, his knees are crossed and his feet are visible. We never once see Jake move to shift his position during the conversation.
Since Charlie had just put his brother back to bed after finding his sleepwalking. And he was outside his brothers room with Rose; which is just down the hallway from Jakes room. How did Jake get behind the refrigerator door without Charlie seeing him. Even the camera angle showed the area behind the refrigerator door as Charlie opened it. And Jake is not seen walking up behind the open door while Charlie is getting his drink. Apparently the way the scene was laid out there wasn't time to have Jake actually walk into the scene.