In the beginning of the episode, when Fiona is on the train, we see the woman next to her getting up and leaving. However, the next Fiona close up after her leaving still shows a bit of the woman's brown coat.
When Debbie goes to open her bedroom door to let Fiona in, she has empty hands. When she turns around after opening the door, she magically has a pillow in her hands.
When Frank walks in on Carl to ask for help to get himself hurt, the TV on which Carl is playing video games is showing an Xbox game and even says to press the A button. Then Carl is seen holding a PlayStation controller, which doesn't have an A button.