Amy goes to the sixth floor to find John Pilgrim, and tries to figure out which room is his, but there should be a blood trail from his wounds.
When Mahoney drives the ambulance through the intersection and swerves to miss the taxi, he's running a red light, but when seen from the other angle the light is green.
After rescuing Sgt. Mahoney from a burning ambulance, a powerful explosion pushes Frank and Brett, knocking them down. The explosion does not, however, move a single leaf from the tree next to the vehicle.
Despite falling front end first from 30 feet to the roadway below, neither Frank, nor Mahoney, are seriously injured when the ambulance goes off the highway.
During the fight scene in Krista's apt, rather than grabbing a knife out of the knife block next to her stove, Krista searched through the silverware drawer looking for a knife.