When they are playing paint-ball, Catarina's outfit is covered in paint. She hides behind the hay bales, and her outfit is clean. Then when she runs away from the hay bales, she is covered in paint again!
actually, it's not clean it's just we only ever see the back of her, which is clean, when she is hiding, but then she runs away and you see the front of her which is covered in paint!
First of all, who cares what her name is. It is an actual slip-up because you do see the back of both of them and they have paint on them. The next scene where they show them again there is no paint. My friend even pointed this out to me.