The children remembered Mr. Poe because he always had a cold and was
constantly excusing himself fromthe table to have a fit of coughing in the next room.
The top quote is from Book 1 (The Bad Beginning) and the next is from Book 2 (The Reptile Room).
The driver of the car was Mr. Poe, a family
friend who worked at a bank and always had
Author Daniel Handler maintains that a solution exists, and can be derived from the books.
In an interview on the Unfortunate Associates podcast, Handler maintains that a solution does exist, and that approximately one reader a year writes to him with the correct solution.
Here's the transcript, beginning at 50:30 minutes into the audio (emphasis mine):
There is a tumblr user by the name of SnicketSleuth who has proposed a brilliant theory. There's such an overwhelming amount of evidence for it that I've personally decided that's the answer Handler hid that he wanted us to find. You can read the theory online here and here and here, but here's a summary as well.
The short version goes like this: the sugar ...
From the Lemony Snicket Wiki: (You can skip to the bottom if you don't want to read)
There are many clues and hints about the sugar bowl and what it is, but Lemony Snicket does not reveal its secret at all in the series, leaving an element of suspense for the readers. The Slippery Slope indicates that the sugar bowl contains something that proves Lemony ...