Visible crew/equipment: When the camera passes Elizabeth in the phonebox saying "Yes, that what he said...", the reflection of a crewmembers face is perfectly reflected. Then (in the same shot), as the camera pulls back and goes past the phonebox again, his face is once again reflected. (00:05:05)
Continuity mistake: Nigel knocks a box of cornflakes to the floor, and it lands on its side. Then in the next shot the box is standing upright. (00:59:00)
Continuity mistake: When Fred throws three teddies from out of the closet, they land on the bed that Elizabeth's on. Between shots the colourful, striped doll moves from beside Elizabeth, to behind her on the pillows, to beside her again. (00:15:55)
Continuity mistake: Elizabeth is sleeping, the night she arrived home with her mother. There's a wide shot of her room and there's no glass of water on her bedside table. But after she has a dream about Drop Dead Fred slapping her from behind a pillow, there is a glass of water on her bedside table. (00:13:00 - 00:14:10)
Continuity mistake: When Elizabeth is having dinner with Mickey, Fred grabs Elizabeth's hand, and starts to shake it while she holds her wine glass. In one shot he's grasping her hand, but then in the next shot, he's gripping her wrist. Between these two shots, which hand he is gripping her with changes too. (00:47:00)
Continuity mistake: When in the kitchen, Elizabeth's mum takes off her pink rubber gloves and then goes off-screen, assumingly putting them away. Then when Fred is getting 'killed by her death breath' you can see the gloves sticking out of the kitchen sink, but a shot earlier than that you could see that the sink was empty. (00:20:25)
Continuity mistake: As Elizabeth makes coffee, the direction the milk carton faces changes. (00:19:50)
Continuity mistake: The position of the pile of cornflakes spilt on the floor changes between shots, through the mud pie scene. It also has changed when Elizabeth goes back into the dining room on her own, after her mum taped up Drop Dead Fred. (01:02:50 - 01:04:50)
Continuity mistake: After making the mud-pie Fred jumps into his box. In the closeup as he lands in it and Elizabeth closes it, you can see Elizabeth has pink trainers on. In the previous and following shots she has white socks on. (01:02:50)
Continuity mistake: When Elizabeth bumps into Mickey, she drops her box of belongs, which scatter over the floor. She then puts them all back in the box, filling it right to the top. But when she gets up you can see halfway into box, and you can see there's nothing in it, but then when she's outside, sitting down, her box is once again full to the top with her belongings. (00:07:15 - 00:09:45)
Answer: When she trapped Fred in the box, she was closing off the part of her imagination. The part of the brain that stops believing in fairy tales and decides to grow up.