Sam's jacket goes from being covered in mud at the beginning to being just barely dirty a few scenes later.
Talley claims to have gone to sleep in Afghanistan the day before, yet doesn't have a deployment patch. The flag should also be gray-scale instead of colored.
Like many shows, Hebrew names are mispronounced. The Yellow-Eyed Demon's name is not "A-ZAY-zel", it's "Ah-zah-ZEL", with the emphasis on the last syllable.
The abandoned town of Cold Oak, South Dakota, supposedly the most haunted place in America, does not exist. According to the wiki page, it's partly from Bordertown, The town was built on a ranch east of Vancouver, Canada.
Gabe Tigerman admitted on the podcast Supernatural Then and Now, it's November 27, 2022 airing, that he did Andy's earring on the wrong ear.
Jake states that he was in Afghanistan a year ago when his abilities started manifesting, meaning he has been in the Army at least 18 months as most soldiers undergo at least six months of training (basic and advanced Military Occupational training) before being deployed to a combat zone. Yet he is wearing the rank insignia of an E-2 Private, a private in the Army is automatically promoted to the rank of Private First Class upon serving as an E-2 private for six months and completing their advanced occupational training and being posted to their first deployment. As Jake has been deployed for at least a year he would likely have reached the rank of Specialist or Corporal by now, depending on which advanced occupational training path he took.