When Sam, Dean, and Bobby find the family deceased on their couch in front of the television from the effects of Sloth, the corpses are much more decomposed than they should be. The gate had been opened only 5 days earlier and even if Sloth had gotten there right away, it would take 4 days for them to die of dehydration, meaning they could only have been dead and decomposing for up to 1 day when the guys found them.
The hunter Tamara is British. The British pronunciation of her name differs from the American. It is pronounced Tam-arr-ah, not Tam-ra.
The beginning of the episode is supposed to take place in Oak Park, Illinois where you see a lovely view of Chicago in the distance. However, there is nowhere in Oak Park where you'd be able to see Chicago.