When Charlie was telling Sam and Dean about the attacks she told them it happened in Salina..she used the California cities pronunciation instead of how it is actually said in Kansas as Sa Line ah. Since she was originally suppose to be from Kansas and had been back visiting she should have known how to say Salina. Also you showed Salina in Shawnee county when it is actually in Saline County.
Charlie's British Passport is the wrong design/format. Nowhere on our Passports is the Union Flag featured nor is it blue. Ireland is considered a solo nation as part of the European Union, Northern Ireland is part of the United Kingdom. The information on the photo page is incomplete and in the wrong places.
When Dean wakes up in the military uniform. The shoulder insignia is that of the US Army Medical Command. That particular patch was not authorized until 1973, 22yrs after the 1951 setting.
As Charlie is leaving the bunker after saying goodbye to Sam & Dean, there is huge structure in the background that reads "VITERRA" which is a grain processing company in Canada. The bunker is supposedly located in Kansas.
When Dean calls Sam from Charlie's phone, the slide to unlock screen is visible for a while until the phone goes black.
When Dean first wakes up and finds himself wearing a U.S. Army uniform the rank insignia on his left shoulder is backwards.
After Charlie impresses Dean with her shooting skills she almost points the pistol's muzzle at Dean's belly, a violation of basic firearms safety which would have earned a rebuke from Dean.