I recently purchased my first cast iron grill pan. After seasoning it
and cooking burgers in it, I noticed a small hole in the inside
bottom. The only reason I even noticed the hole is because there was
grease in the pan and it caused the hole to bubble. I'm wondering if
this hole is normal or if I should take the pan back and exchange it.

Here are URLs to pictures of the hole in the pan:
http://i290.photobucket.com/albums/ll246/1mj1/pan2.jpg
http://i290.photobucket.com/albums/ll246/1mj1/pan1.jpg

The pan is Emerilware which is made by All-Clad. Do you all think I
should exchange it?