Eerie #1 ashcan is a white elephant in as the original printing was very difficult to find, and was indeed rushed out to local locations near the Warren headquarters so they could show that they indeed already had a product called Eerie on the market. It was nothing but that. They didnt really care about content so they just threw it together. Now as far as the differences between the original and 2nd print, or "bootleg ". The story goes that the original plates were used to make the "2nd print" and that someone who actually worked at Warren found them and reprinted a certain amount(unknown) at the Warren headquarters. Jim Warren had his suspicions as to who this was , but could not be positive.
I'm pretty sure page 18 panel 5 has a blacked out area where they blacked out a mans bald head on the original copies, but on the 2nd print the bald man was indeed there, hence why they know the original printing plates had to have been used.
On the second print the 2nd print had blue lining on the staples, where as the original had plain staples. There is a certain sheen to the printing on the paper as to the type of printing and ink used in the process. Xerox copies could not replicate, so buyers of any copies beware. There are several tell tale signs , but these are the most telling.