Near the end, Sarah triggers an explosion by hitting the previously placed explosives with an arrow. The explosion is shown in 2 successive shots. In the 2nd shot, one of the O'Hara brothers behaves like he was standing near the explosion and got gravely injured. However, it is blatantly obvious that there was nobody near the explosion in the 1st shot, which means that O'Hara abruptly appeared there between the shots.