It's a really thick pile carpet (i thought too nice a quality for a play room... but i got out voted), so those lines are hover marks so carpet fibers going in different directions. It's so thick we can't close the door and need to plane it...
Thanks, I thought that might be the case, could not quite work the pattern out.
May I make a little suggestion to think about as opposed to wrecking the door for future needs?
Just change the hinges for some of these type and no messing with wood cutting and door bottom repaint?
Rising Butt Hinges - Our rising butt hinges come in stainless steel and electro-brassed finishes to ensure strong, durable and long-lasting hinges. - The rising butt hinges design allows doors to open and raise up on the hinge to clear the thickness of your carpets. Doors can easily be removed...