Surrounding the cover illustration of each book is a border. The border describes an aspect of the book.
The Bad Beginning- Eyes
The Reptile Room - Snakes
The Wide Window- Waves
The Miserable Mill - Hypnotic Spirals
The Austere Academy- Measuring Tape
The Ersatz Elevator- Fish
The Vile Village- Feathers
The Hostile Hospital- Cardiogram Display
The Carnivorous Carnival - Ticket Stubs
The Slippery Slope - Snow Gnats
The Grim Grotto - Waves
The Penultimate Peril - Fire
On the first page of every book, there are two circular pictures. The first one, on the top of the page, usually has the Baudelaires in it. The second picture, on the bottom, is of Count Olaf and the disguise he wears in the book.
The Bad Beginning - The Baudelaires, Olaf
The Reptile Room - The Baudelaires, Olaf as Stephano
The Wide Window - The Baudelaires, Olaf as Captain Sham
The Miserable Mill - The Baudelaires, Olaf as Shirley the Receptionist
The Austere Academy - The Baudelaires, Olaf as Coach Genghis
The Ersatz Elevator - The Baudelaires, Olaf as Gunther
The Vile Village - The Baudelaires,Olaf as Detective Dupin
The Hostile Hospital - The Baudelaires, Olaf as a Loudspeaker
The Carniverous Carnival - The Baudelaires as Freaks, Olaf
The Slippery Slope - The Baudelaires as Snow Scouts, Olaf
The Grim Grotto - The Baudelaires in Underwater Gear, Olaf
The Penultimate Peril - The Baudelaires as Concierges, Olaf
At the end of each book, the last illustration features a picture describing something from the next one.
The Bad Beginning - Snake wrapped around a pole
The Reptile Room - A Man has "Lachrymose Leeches" written on his shirt
The Wide Window - Sign of a pair of Glasses.
The Miserable Mill School Bus
The Austere Academy - Olaf's car has a bumper sticker of a fish
The Ersatz Elevator - A Crow
The Vile Village - The Daily Punctilio reading "LAST CHANCE".
The Hostile Hospital - A flyer reading "Madam Li-", a crystal ball, and a mask.
The Carniverous Carnival - SnowScout Handbook.
The Slippery Slope - Mushrooms
The Grim Grotto - Hotel D hat
The Penultimate Peril - Crows?
Miscellaneous Facts
Count Olaf's Car in "The Carnivourous Carnival" has a liscense plate that says "I Hate Orphans": I H8 ORFNS. The Carnivourous Carnival, Chapter One illustration
Lemony Snicket researched for 9 months, 6 days, and 14 hours before determining Hal was not a spy. The Hostile Hospital, Page 69

The V.F.D Insignia has "VFD" hidden i
n the eye.
Page 154 of "The Reptile Room" has the word "ever" written 194 times. The Reptile Room, Page 154