Empire of the Petal Throne (I don't know if any text changes or maps etc, but I doubt they do since there is no update as to copyright and date in the books for all 3 printings)
1st (7?/75): Pg 114 has component list along with some items released by TSR (SR, etc), facing page (inside back cover) is blank / Simplistic backer sheet that wasn't attached to the bottom of the box (blank otherwise) in any way other then by the shrinkwrap / no product number in top right corner.
2nd (after 7/76 before 3/77): Pg 114 has component list along with some items released by TSR (same as 1st), facing page (inside back cover) has product list / Backer sheet (now with photo of contents and more description) that wasn't attached to the bottom of the box (blank otherwise) in any way other then by the shrinkwrap / no product number in top right corner.
3rd (3/78-8/78): Pg 114 has component list along with some items released by TSR (new to reflect price increase and other items - The Dragon, etc), facing page (inside back cover) has product list (new - matches BLK 5th (3/78), ELD 5th (3/78 ), GDH 4th (5/78),
GH 9th (5/78), CM 6th (8/78 ) and Metamorphous Alpha 2nd product lists exactly)
/ Bottom of box is now printed on with the same image/text of the backer sheet found with the 2nd / product number in top right corner.
ShaneG.