In the fight near the end of the movie, the bad guy's right hand is injured and he drops his knife. In subsequent shots the knife repeatedly switches between his left and right hand.
At the end of the movie, Sasha, Mya and the dog are near to a car, opening doors. Behind them, we can see 2 guys coming in the background. In the next wide shot, these 2 guys have suddenly disappeared.
When Sasha is trying to escape he removes the hinges from the door. But after he takes the door down you can clearly see the door was already unlocked! He could easily just open it.
In the final fights, Steven Seagal uses his sword to cut off a hand from one of his opponents. First in slow motion where the hand comes off, than the same move again at normal speed from another angle. When at normal speed, you can see that the hand doesn't come off.