The article of the Asylum deaths in John's journal is at first on a page next to the Wendigo entry. In the scene in the Asylum, the article is one page after the Wendigo entry.
As they walk down a corridor, they hear something and turn round quickly. The corridor they just walked through was almost totally empty when they walked down it, but is now littered with screens and trollies that they would have had trouble walking around.
Dean's lighter went out of order once but some minutes later it was on again.
In a couple of scenes is shown a door with the internationally recognized biohazard symbol on it. The symbol was created in 1966 by Dow Chemical while the asylum is reported to have closed in 1964.
The text Dean gets from John supposedly contains the coordinates for Rockford, Illinois. The only thing the text said was "42, -89", which are very vague coordinates and not specific enough to indicate a town, in order to do that the coordinates would need to contain minutes and seconds as well. 42° N, 89° W is a point somewhere in the middle of Illinois, a few hundred miles from Rockford. The actual coordinates for Rockford, Illinois are 42.2711° N, 89.0940° W.
Sam tells Dean that they should "go to the feds" regarding their missing father.
The federal government rarely (if ever) investigates a random missing persons case. Those cases are investigated at the state and local levels and since he's pretending to be a federal agent, Sam would need to know that or risk blowing his cover.
Additionally, since their father was likely wanted for a variety of crimes, it would be very unwise for the brothers to go to the federal law enforcement system as when he was discovered he would be immediately arrested.
The federal government rarely (if ever) investigates a random missing persons case. Those cases are investigated at the state and local levels and since he's pretending to be a federal agent, Sam would need to know that or risk blowing his cover.
Additionally, since their father was likely wanted for a variety of crimes, it would be very unwise for the brothers to go to the federal law enforcement system as when he was discovered he would be immediately arrested.