*click* Light bulb went on. I laid the two printed sheets together (landscaped) and then set a third page on top of them rotated 90 degrees (portrait). Whaddya know, the edge of the portrait page bumped right up against the final row that was displayed. Not sure how she managed to do it, but the printed page was landscaped but displayed/rendered in portrait mode.
Nifty SSRS pages I wish I had more time to read