How do I see what variables are firing on what pages?

There are several methods to check this, I would suggest httpfox or fiddler for one time validation, but newer tag monitoring tools like Qmon for continuous validation of your sitecatalyst implementation.

You probably want to use a tool that validates in realtime; crawler or simulation tools are not going to work for your goal. Also you want to set up the validation rules once, and let a tool check the set of validation rules on each google analytics request afterwards (then you are validating 100% of your data). This reduces regression testing time a lot.

Take a look at Qmon, it takes a whole new approach to data quality: Qmon - easy webanalytics monitoring.

PS. I'm working for Adversitement, who invented Qmon