During Joe's first meeting with his wife at the park, he declares that O'Neill is head of the SGC. However, he then has a vision of the battle of Antarctica, at which time, Dr. Weir (version 1) was running the SGC, and Jack was about to go into stasis.
When he first confronts Jack in the kitchen, Joe's grip on the gun changes depending on the angle.
Joe's employee Gordie mentions that he dropped off an application at the local Piggly Wiggly. There are no Piggly Wigglys in Indiana where the episode is set.
When the letter carrier is delivering Joe's mail to his shop, the uniform is clearly not that of a United States Postal worker, yet the mail box outside has the USPS logo on it.
When Joe meets his wife in the park the first time, a black GMC vehicle is visible parked up. It appears to be the same one that O'Neill arrives in during the final scene in the same location.
General O'Neill is wearing combat boots with his dress uniform instead of dress shoes. Even an Air Force general should follow uniform regulations.