They're Tearing Down Tim Riley's Bar - S1-E17
Continuity mistake: When Randolph Lane swivels in his chair, his hair changes from slightly mussed to disheveled.
Continuity mistake: A UFO crash lands in Canada and sits amidst trees in a wooded area. Just before the craft explodes, the only snow visible is on mountains in the distant background. After it explodes, however, the ground and trees all around it are suddenly covered with snow. (00:36:30)