Sam says that the voicemail from Donatello is "Ancient Hebrew" and identifies it as from 1 Peter 5:8. However, 1 Peter was originally written in Greek, not Hebrew.
When Dean and Mary enter Donatello's home, both of their guns are cocked. Dean's model 1911 pistol is carried that way. Yet when they encounter Nick, a gun cocking sound is heard. This same error takes place a few minutes later when Dean pulls in Nick.