Other mistake: When Maitland shoots Axel in his house, he has a large calibre hand gun. The shot was in Axel's right arm, just below the shoulder, apparently straight on, as only one hole is seen. The hole was way too small for the size gun and should have easily penetrated into his lungs making it difficult for Axel to breathe. It also would have damaged the bone in his arm making it impossible for him to use it.
Suggested correction: Depends on the ammo being used. Maitland seems to be firing a .357 Magnum revolver.