In "Fights and Stuff", Dan wasn't supposed to exercise for two weeks when he got home. When he is supposedly exercising, we are to assume that the episode takes place within 2-3 weeks. However in the Call Waiting episode, Dan reminds David that he has only been married 8 days. This would be a mistake because he and Darlene were married the same day as Dan had his heart attack so there for they would have been married 3-4 weeks as Dan was in the hospital for at least a week.