What causes these types of bubbles?!

[TXCraig1]

Why would a rolling pin be any more gentle than how they stretch at Patsy's or John's?

I don't think it is. I think it's more damaging to the dough which is why I think you tend to get more of the big bubbles. 

[Dutchgirl]

Right now baking a pizza....
I don't see dough hydration mentioned. Which is what causes bubbles in mine, aside from baking at 475 ish. (highest as my oven will go)
Sourdough base with dough hydration 70%

[baceki]

[QwertyJuan]

You made a pita?? 

[instafun365]

Hans,

I used to think the dough was very thin, but I don't think it's as thin as I originally thought. Here is an excellent video of the pie being made...even in the title picture the dough doesn't look all that thin on the edge...

Do you know which company provides an oven like that?