Continuity mistake: While Michael Malone and Gen. Patton are discussing what just happened in the subway, in the background, two ACLU zombie-lawyers begin chasing an ambulance as it drives away. After a brief cut away, we return to the same view - and the same zombie-lawyers chasing the same ambulance.
Continuity mistake: When Justin gets his sex toy home, he turns his family photo facing down on his nightstand. He turns the photo down square with the nightstand. The next cut, the photo is turned 45 degrees to the nightstand. (00:14:10)