Roseanne states that she got two tickets for WrestleMania in an attempt for DJ to have to buy one from his friend. This was supposed to be in November, and WrestleMania only takes place in the Spring. Also, WrestleMania was not in Illinois around that time.
When Dan takes out a beer from the refrigerator he sets it down on the kitchen table and it moves when he sets it down indicating the can is an empty prop.