They would stop the press to make corrections. A different state does not justify a new record, because the differences are minimal. Different states are still part of the same edition, but if bibliographers have noted the different states, make a copy specific note. Always separate editions. Generally, do not separate states.
Editions are a murky issue, because publishers often sold their plates to other publishes.
260 Rule 4C6 advises a cataloger not to abridge before the 3rd name, and further recommends not to abridge before the 5th name. Make a distinction between personal names and companies. 300 Take a count of every printed leaf, despite what the pagination states, taking into account inserted plates. If the pages are numbered in terms of leaves, use that count in the 300, but supply a note saying that pages are printed on both sides. This way is only best if it is a final page.