There are many plugins, applications, extensions, and everything in between to help you diagnose issues with your implementation, here is a list of some of the more popular options.

1. Google Analytics
Debugging Tools
By: Errett Cord
Email: ecord@ecord.us
Twitter: @errettcord

2. Google Chrome
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Google Chrome’s developer console is an invaluable tool for peering into
the inner workings of your site and implementation. You can quickly and
easily pull up class information by right-clicking any element of the site and
inspecting that element from the drop down. The console allows you to fire
off javascript code to see how the site responds. If you use another
browser, ensure you use Google Chrome for your troubleshooting
activities.

3. Real Time Reports
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Many people leverage real-time reports for insights into how their site is
performing at the time. While this is the primary function of these reports, the
majority of time you can spend looking at real-time activity is during testing to
ensure GA is receiving the data the site is sending. There is a send and receive
relationship between your website and Google Analytics servers, and being able
to put eyes on both ends of the transaction is a great way to see if your data is
being received, not just being sent. Keep in mind when viewing these reports
they are affected by your view filters.

4. Ghostery
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Ghostery is a plugin compatible with multiple browsers that gives you the most
basic information. When you land on a website, a little floating purple box appears
in the top right hand corner of your window, displaying a list of the analytics tags
that are firing. It’s very simple. You also have the option to disable calls to
particular services on the list if you so choose. If you’re a layman when it comes
to web development, this would be the best place to start.
Plugin Link

5. GA Debugger
This plugin is a little more advanced but it dives deeper into the data
being sent to Google. Enabling this plugin will result in a wealth of
output information for the console in Chrome’s developer tools. You will
be able to see everything from your source, medium, and keywords to
the details of events, page views, or virtual page views. Quite literally
every dimension and metric being passed to Google is laid out for you
in the console. As detailed as this information is, if you understand the
reporting aspects you’ll understand the output in the console. No need
to shy away from using this if you’re not a developer.
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Plugin Link