Here's a list from the creator. I'm not sure if they're all always there:
"Here is the semi-official list of symbols, more or less in order of frequency of use: eyeball, piece of pie, alien, dynamite, K2, upside-down bird, bunny head, crown, single shoe, arrow in the back.
They began in 1996 when I decided out of boredom to draw a little bird sitting on a shelf where it didn’t really belong"
Did you know that every Bizarro comic has a hidden eyeball (bottom right), alien (top right) and piece of pie (can't find it in this one)?
please tell me this is true, I've been looking for the pie for 5 minutes now
Here's a list from the creator. I'm not sure if they're all always there:
"Here is the semi-official list of symbols, more or less in order of frequency of use: eyeball, piece of pie, alien, dynamite, K2, upside-down bird, bunny head, crown, single shoe, arrow in the back.
They began in 1996 when I decided out of boredom to draw a little bird sitting on a shelf where it didn’t really belong"
Well there's an eye on bottom right, and alien top right
that's cool, tyvm
These are examples of the secret symbols you can find in the comics a full list with explanation is on the official bizarro website
They are not all always there, just sometimes. There is a number on the signature which tells how many are hidden for each comic.
Oh! I didn't know about the number!