The first time Vanessa and her mom return from an audition, she is in the front passenger seat next to her mom. However, when they pull into the driveway and she gets out. She is in the back passenger seat behind her mom.
When the three girls are in Vanessa's bedroom and they are all playing on their DS, Lizzie's DS has a white paper, or piece of tape on the back of her DS in the wide angle shots of all three, but in the close up shots with just her, the tape is missing.