When Sheldon goes through his membership cards, the camera zooms in on the Radio Shack card with his full address and it shows a zip code of 88597. According to USPS, this zip code does not exist and all zip codes in Texas begin with a 7. While this is most likely intentional as the address itself is fake as there is no city named Medford in Texas at all, the zip code used wouldn't be entirely wrong. Some areas of El Paso, Texas are serviced from a USPS distribution center located in New Mexico, which actually uses zip codes in the format of 885XX, and thus those parts of El Paso use that zip code format. (The closest big city to Medford, apparently, is Houston, so in real life, this still would not be the case.)
The dead husband's jacket is a woman's jacket. The buttons were on the left side.