This issue is a variant of Zap Comix (Apex Novelties, 1967 series) #2. There exist further variants.
Early printings by Apex Novelties. Later Printings by Print Mint or Last Gasp with the Apex Novelty logo still on the cover.
Underground Comix are known for using different prices, covers (art or color variations) and/or interior content to distinguish between printings.
1st print has 0.50 USD cover. Has heavy cover stock.
2nd print has 0.50 USD cover. Some have heavy cover stock, most have regular weight cover stock.
3rd print has 0.75 USD cover. 4th print has 1.00 USD cover. 5th print has 2.50 USD cover (published by Last Gasp).
6th print has 2.95 USD cover. 7th print has 3.95 USD cover. 8th print has 4.95 USD cover.
One pager with an early abstraction of Mr. Peanut.
One pager of scatalogical humor.
One pager with abstracted duck.
One pager with abstracted bear and frog.
One pager with Escher-like boxes, abstracted Mr. Peanut.
camels, gladiators, hot dogs.
First appearance of Griffin's angelic and demonic flying eyeballs.
Sequence on inside back cover with abstracted duck and mouse.
Some information for this sequence from Denis Wheary via the GCD Error Tracker.
Sequence on back cover of issue.