For the hem, I just cut it straight across and threw them in the washer/dryer to get some fraying.
For the rip, it was previously a slit like the other knee. I just cut another slit above it and another slit below it and pulled out the warp threads and left the weft.
Some of the weft broke apart and that's what you see hanging on the sides. I imagine even more of that will happen with continued wear.