After Mick has poured his tomato juice and put it down, the glass changes from being next to his arm to be behind the juice bottle between shots.
At around 25:43, Mick's (far right in this scene) left foot slips whilst walking, causing him to falter very slightly.
Young Mick had dark brown eyes, Adult Mick has light green/blue eyes.
Dagon tells Kelly that birthing a nephilim is always fatal, however, in a previous episode, Castiel and several other angels show no surprise that the mother of a supposed nephilim is alive. Either Dagon is mistaken, lying, or this nephilim is different because the father is not just any angel, but is Lucifer.
When Mary and Arthur Ketch are talking Mary is in the bathroom talking to a mirror reflection of Ketch who is clearly visible in the mirror. However when we hear Ketch talk we speak his lips do not move in his mirror image. There is no audio for his mirror reflection.