In the scene when Sandra is freaking out near the Christmas tree and packing up her presents preparing to storm out, almost every shot of her, has her holding a different assortment of presents.
When driving home after picking up Roger and Jason, Carey is not in the car, yet he was with Max when they went out looking and he got out of the car when they got to the house.
At one point, Audrey comments about having a Diet Free Dr Pepper, which doesn't exist. Either she meant Diet Dr. Pepper, or Caffeine Free Dr. Pepper, or Diet, Caffeine Free Dr. Pepper.
On Christmas Eve the family, and their neighbors, put out candles inside paper bags along the walkways. They call them "luminaries". Luminaries are inspirational people or heavenly bodies. The correct name is luminarias or farolitos.