(at around 1h 12 mins) When the central garden at Wilpharma is incinerated, Leon and Angela escape through a drainage system and are fully submerged in water. A few seconds later, their hair and clothing seem perfectly dry.
After the self-destruct system blows up, Claire suffers from an injury that causes her to limp a lot. Later on, after Leon defeats Curtis, Claire is no longer limping and appears perfectly healthy.
(at around 25 mins) During the Airport escape scene, one character armed with an M4 Carbine shoots continuously beyond the ammo capacity of his gun without ever reloading.
The Marines in the movie are wearing ACU BDUs, a pattern used by the Army. They should be wearing MARPAT.