Discretion, they decided, was the better part of velour.

 Best spelling mistake ever!

Unfortunately it's mine, and the second last line of Graveyard Shift (bar the epilogues). Fortunately I have an irritatingly good line-editor.

I got the line-edits late Saturday, the house has been echoing to cries of "How did I miss that?" ever since.

The answer for the handful of spelling mistakes is probably I really do need bifocals. The answer for the logical problems isn't so simple, but it's an interesting exercise in how ingenious a fix can you dream up on short notice.