Corrected entry: After Vanessa comes to the door, and they find out that DJ moved out of the room, everyone starts going upstairs, and Jesse takes Vanessa's hand so she will go with him. In the hallway, right before they enter DJ's old room, you see Vanessa behind Jesse since you can see her peach dress. But then it's like she disappears and she does not ever enter the room.
Corrected entry: Stephanie and DJ use spray-in purple hair dye and change their whole hairstyle while they listen to Jesse's band play. Then their dad comes home, sends them upstairs, and in a matter of minutes their hair is back to its normal color, the same style as it was before they put the dye in it, and it's dry. They would have had to wash the dye out with water.