In the precinct with the 60 missing voters, could they have just left
after they first voted, thinking their main job was done? They weren't locked inside, were they?
http://www.desmoinesregister.com/story/news/elections/presidential/caucus/2016/02/02/sometimes-iowa-democrats-award-caucus-delegates-coin-flip/79680342/
It happened in precinct 2-4 in Ames, where supporters of candidates Bernie Sanders and Hillary Clinton disputed the results after 60 caucus participants apparently disappeared from the proceedings.
As a result of the coin toss, Clinton was awarded an additional delegate, meaning she took five of the precinct’s eight, while Sanders received three.
Similar situations played out at various precincts across the state, but had an extremely small effect on the overall outcome, in which Clinton won 49.9 percent of statewide delegate equivalents, while Sanders won 49.5 percent. The delegates that were decided by coin flips were delegates to the party's county conventions, of which there are thousands selected across the state from 1,681 separate precincts. They were not the statewide delegate equivalents that are reported in the final results.
The statewide delegate equivalents that determine the outcome on caucus night are derived from the county-level delegates, but are aggregated across the state and weighted in a manner that makes individual county delegate selections at a handful of precincts count for a tiny fraction of the ultimate result.
= new reply since forum marked as read
It's not amateur hour if Iowans have chosen to do it this way forever. 4) If you have a problem with their method after informing yourself of all the facts, take it up with Iowa.
Enjoy the rest of the season. 
Edited to add: Decisions by chance have a long history in the US and elsewhere. Coin toss, dice roll, cut a deck of cards. It's legal and there's lots of precedence.
