In the middle of Lorelai and Rory's conversation over the phone about going to the mall, Rory's cold that caused her to miss Friday night dinner mysteriously disappeared.
Mrs. Kim is a Seventh Day Adventist who worships and does not work on Saturdays; it is even mentioned that her antiques store is open Sunday through Friday. However, in season 4, a sign in the window states that the store is open Monday through Saturday making pious Mrs. Kim break the Sabbath.
When Lorelai and Rory are discussing their mall trip, they say neither of them have any money to spend, and they make mental notes of things they want to come back and buy when they have money. However they manage to pay for a lot of food in the food court with no problems.