As far as I know, there isn't any debug mode. I am using firebug with Firefox (if you are using chrome you can go for the chrome developer tools), and that can show errors associated with the syntax when a chart is not properly rendering.
Here is the link https://getfirebug.com/downloads
It's like a console appear in the bottom of the web browser showing all the data transactions.
Necro, but probably still relevant for people who end up on this question: Highcharts >7.0.0 adds the possibility to show render errors on graphs.
debugger.js file which that page talks about can be found on the Highcharts zip under
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