This is the first time Father Mulcahy is shown wearing his "Loyola" hoodie.
Colonel Blake says, "Better keep the brass monkeys in tonight." This refers to "cold enough to freeze the balls off a brass monkey" a colloquial expression used to describe extremely cold weather. There are multiple views regarding its origin.
Father Mulcahy enters the "swamp" wearing a hoodie that says "Loyola".
Loyola is a jesuit university in Maryland, USA.
When Col Blake walks into the office you can see the back of the filing cabinet, this is where the side of the tent should be otherwise known as the forth wall.