Continuity mistake: When Polly is telling young Elizabeth a bedtime story, you can see Elizabeth's soft-toy monkey 'Mr. Poo' laying behind her, but in the next shot she has him cuddled in her arms. (00:00:45)
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)
Continuity mistake: When Elizabeth drops her box of belongings, her stapler lands a long way away from the box. Nobody reaches over to get it, then in one shot, Elizabeth just picks it up from beside her and then drops it into her box. (00:07:35)
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 Fred says to Elizabeth "I'm going to have to be sick on you immediately, lie down!" you can see Fred grab the glass of water from the bedside table. Yet in the following wideshot, Fred jumps off of the bed without the glass of water, and he doesn't put it down anywhere, it's just disappeared. (00:15:40)
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: As Fred rips up 'Mr Poo', feathers fly everywhere in the air. Between shots the feathers in Elizabeth's hair differ, and then when Fred leads her out the room, all the feathers have disappeared from her hair. (00:16:25)
Continuity mistake: As Elizabeth makes coffee, the direction the milk carton faces changes. (00:19:50)
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: In the back garden, Fred hits Lizzie in the head with a shovel, then throws the shovel down so it lands by a stand of flowers. Later, when Fred kicks Lizzie and runs out the garden, the shovel isn't there. (00:23:45)
Continuity mistake: When Elizabeth walks out of Janie's house-boat and sees who she thinks is Charles in a boat, she has a mug in her hand. Between shots, the way she holds her mug changes. (00:39:05)
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: In the restaurant when Elizabeth is eating with Mickey, Fred makes her pour her glass of water on herself. When Mickey and she are chucked out of the restaurant, her dress has a wet patch on it, but when she walks off and Fred follows, her dress is dry and clean in the next shot. (00:49:50)
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 and Elizabeth make the mud pie, as Fred is pouring various things onto the mud, the amount of mud on his hands / wrists differs throughout the scene. (01:01:10)
Continuity mistake: After Fred pours the milk on the mud pie, the mud changes from a large whole clump, to spread out clumps of mud, and the position / amount of cornflakes on it also differs as well as the plates surrounding it. (01:01:35)
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 Lizzie listens to Charles on the phone to Anabella, she drops her prescription bottle. Then when she falls into Fred and they disappear, the prescription bottle has gone. After Lizzie comes back after the surreal journey, the prescription bottle is still there on the carpet. (01:20:30 - 01:27:05)
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.