There is a part in the movie that The Rock has gotten pretty beat up and has three slashes in the front upper right part of his shirt. Then later in the movie where he is walking away from a huge explosion, the slashes mysteriously appear on the upper left side of his shirt.
actually that would be in the rundown, i have noticed that too, also i think the slashed swiching sides could be explained in the fact that his shirt is inside out and backwards maybe? thats highly unlikely but could be possible