The title is a direct reference to a plot element. Jus in bello means "justice in war" and refers to the guidelines for "fighting well" once war has begun.
First time the anti-possession tattoos are revealed.
The aliases listed on Dean's wanted poster are: J. Mahoggoff, Jerry Garcia, John Smith, Donald Strump.
This is the only episode of the series that includes both of the season's recurring female characters Ruby and Bela ( Katie Cassidy and Lauren Cohan, respectively), though they share no screen time.
Sam and Dean show everyone their anti-possession tattoos over their hearts. Dean has a pentagram with one point up whereas Sam's is the inverted pentagram (one point down). This is a common symbolic difference where the inverted pentagram is considered a satanic symbol. This may have been an accident in placement, or a subtle nod to Sam's demonic tendencies.