A sad case indeed. I wonder whether he will receive compensation? While I admit mistakes are sometimes made, this looks like outright carelessness.
Looking at other cases of innocent people imprisoned, I noticed a lot, but not exclusively, are in the USA, with its massive number of people in prison, disproportionately men of color. For instance, Richard Phillips spent 46 years behind bars for something he didn't do. An innocent Maurice Hastings spent 38 years in prison. These days, DNA evidence helps, but it takes effort to review these cases.
Even worse, some are executed and found innocent when it is too late. This is one of the reasons I don't think the death penalty is a good idea.
I applaud the Thai authorities for investigating further and releasing Anucha after 80 days as we know it could have been much worse.