Continuity mistake: The 1st scene where Harry blows a horn in Anna's ear, she chased him out of the room and her blanket was thrown over on the RIGHT SIDE, but if you look close when she goes to close the door the blanket it almost all the way off the bed on the LEFT SIDE. (00:01:35)
Continuity mistake: Once Grandpa takes the underwear off Harry's head and sets it on the counter, it continually moves. Originally it is at the edge, draped over a little bit. Next it moves inward a little. After Mom shuts off the power, it is almost halfway on the counter. (00:11:40 - 00:13:00)
Continuity mistake: The way Tess holds the notepad, to show grandpa the message, changes between the shots. (00:11:30)
Continuity mistake: When Tess is cutting the underwear off of Harry's head, she leaves the scissors on the counter away from the pile of the pieces of the underwear. Later you can see that it is in the pile of underwear. (00:11:25)
Continuity mistake: When Anna is talking to her friends at school, her shirt has a patch of white fabric with the guitar design on it. When she is arguing with her mum about her door, the white patch of fabric is gone. It changes back and forth several times.
Continuity mistake: When Pei Pei calls for her mother, she comes from the kitchen. She sees Anna and Tess and tries to escape by going back through the door she came from, but when the camera cuts back to her, she is about to enter the other door. (00:49:48)
Answer: You need to think back to the poem... "A journey soon begins, its prize reflected in another's eyes. When what you see is what you lack, then selfless love will change you back." It says a journey SOON begins, not immediately, and it says "WHEN what you see...change you back". Basically the switch happens SOON, the switch back happens IMMEDIATELY.