Continuity mistake: When Gordie is crushing cans, the can changes to one of a different colour between shots.
Continuity mistake: As the nurse hits the ground, agent Ames runs out into the rain and stands in it unprotected. A moment later he runs around a corner and his coat is clearly completely drenched, as well as his hair and face. Ames then makes a jump up a wall and climbs up on the roof. As he pulls himself up onto the roof, both he and his clothes are completely dry.
Answer: Max's disease is specifically tailored to work only on cells exhibiting Logan's genome. No one else would notice it.
Phoenix