When Raven is talking to Santa, she mentions that because she opened her present early, she didn't have a chance to hang the angel on the tree with her mom, but at the very start of the episode, you can clearly see the angel on the Baxter tree long before she opens the necklace.
When Raven, Chelsea, and Eddie are sneaking out of school, they look around the corner on the stairs with Eddie's head on top of Chelsea's. Because his head rested on hers, her beanie fell down and covered her eyes. However, her reaction does not give away the mistake, as she simply made a "Oh shoot" face.