In the section about Thomas Carlyle, the maid leaves one crumpled piece of paper on the floor in front of the fireplace and walks away. When Carlyle wakes up, it is gone.
The Narrator, after telling the viewer tales about Sir Isaac Newton, Thomas Carlyle, and escaped prisoner George O'Flanagan, says, "A third actual case is ..." John Nesbitt already had related three cases of "famous boners", so he should have stated "A fourth actual case ..."