On the first episode of season 1, Ashley was 10, by the time season 1 ended she was 12 and on the first episode of season 2, she said she was 13.
When Carlton tells Aunt Viv he is "not a happy camper," she sets down the oven manual. In the next shot, she is holding it again.
When Phil and Vivian are in Phil's office and if the earthquake knocked out all the power then how can he turn on the stereo?