All kinds of automated data collection such as this will have errors that need to be fixed manually by a human. This will be taken care of if/when we eventually have real artificial intelligence. The data parsing scripts Google and others use are fairly advanced, but they still break down to a couple rules and finding words in close proximity. There is no real intelligence involved here.
EDIT: The important takeaway here is to make sure we continue to educate people (especially government) as to the issues and unreliability of these systems. Death date showing up on Google isn't a train smash, but if some government agency decides that Google is smarter than them? Then we are in trouble.