Oh and would someone tell me what the difference in colors mean of the shirts?
I've never been able to figure out the significance of the shirt colors at the Apple Store.
The Microsoft Store did a much better job with this. Clear, easy to understand. You have 3 types of employees: sales, customer service, and dancers.
Blue shirts are sales:

And the employees that work at the customer service counter wear...well, it's hard to see their shirts for the mob of customers there to pick up their Xbox 360 repairs.

So forget shirt color for customer service. Just look for the mob.
The dancers wear yellow, green, red and blue (but sans hats - that's how you tell the dancers from the sales guy).

Easy! Just like Windows!