Thanks to @BedfordLvlExp on Twitter for pointing out that the following corrections should be made, all on page 229:
"leaving two more twenty-five-character rows to fill" should read "leaving two more forty-character rows to fill."
"the thirty-two pixel borders on the left and right and thirty-five pixel borders on the top and bottom were" should be "this border region, which can be set to different colors, just like the background, was"