Devon Bostick confirmed on Twitter that his character Jasper Jordan was supposed to die in this episode. The cast and crew liked Devon so much, Jasper's fate was changed.
This episode takes place on Saturday and Sunday September 13th and 14th, 2149.
Mount Weather is in the Blue Ridge Mountains surrounded by temperate hardwood forests, oak, maple, walnut, etc. The forests shown are classic taiga evergreens, mostly pine, spruce, fir, etc. as a result of filming in Vancouver.
Murphy scratches a threat to Wells on the dropship. When Wells sees this, he turns to Murphy, who rubs his nose. This would later become a signature move that Murphy does (in We Are Grounders: Part 1 (2014), for example). Richard Harmon improvised this tic; the director wanted him to show that he was holding a knife, that he was dangerous, but it was such a close shot that all he could really do was the nose rub.
The Mount Weather featured is based on the real Mount Weather Emergency Operations Center.