Google AMP pages, and, of course, any page, could have errors, from Google's point of view.

AMP is relatively new, and one way to get around indexing and display errors is to use the Google Search Console, which has a section showing AMP pages.

There are also browser-based tools to help, such as the Chrome DevTools Console panel [developers.google.com...]

There's also AMP Browser extensions, although they are only available for Chrome and Opera.
[chrome.google.com...]
[addons.opera.com...]

Of course, there's the AMP page validator [validator.ampproject.org...]

Here's Google's latest blog post on the topic [webmasters.googleblog.com...]