My experience in OH as a poll worker in OH is that there are so many safeguards in place that no one can be in charge of safeguarding the safeguards, unless it's legit that both political parties have workers when voters sign in, when they cast ballots, and when the sign in book and machine tally are verified to be the same.
Could absentee ballots get cast? Are those extra ballots added after everything is shut down? Are there precincts where nobody is effectively supervising the workers?
Dr. Stein might have created some unintended consequences here. From my experience, I thought that it would make sense to simplify the system, get rid of absentee and early voting, and have Presidential voting only for that and any US Senate races. Where I was, it was honest and the poll workers had impressive pride in things running perfectly. Perhaps it's not that way everywhere.
There are some inner city precincts where there are no actual Republican election judges or poll watchers. These are often high crime areas. I have long thought how easy it would be for the two chief judges, both of whom are Democrats though one signed (legitimately) the Republican line, to just vote again and again after the polls closed. That's my theory on why Dem cities so often report hours after the rest of the state. They wait to find out how many additional votes will be needed.
When Philadelphia reported before many Republican leaning areas of Pennsylvania, I had real hope that Trummp would win. Perhaps there were Republican workers/watchers in most Philadelphia precincts. There is no need to report late if you are being watched for cheating.
Remember the big brouhaha before the election where the Libs went to court to stop Republican poll watchers from being allowed into certain inner city precinct, because they might intimidate voters. This is why. There are no Republican poll watchers in inner city Chicago, Detroit, Philadelphia, Los Angeles due to a courts ruling in the 80’s.