Black artifacts in some rendered images of a text I'm a complete newbie and was wondering if I had set up something wrong.

I used the 20th Century fox blend and successfully rendered 600 jpg images. Looking good, except that about 30% images have a corrupt T in "Century".

I've spent several hours going through about 200 frames trying to smooth the error out with Gimp. Just wondering what cause the fault and if there is any way to correct it a bit quicker..
It looks like a topology problem.  You can convert the text to a mesh (Alt +C) and try the following.
 - Recalculating the normals (enter edit mode, select all, Ctrl+N)
 - Check for non-manifold geometry (edit mode - vertex mode, make sure nothing is selected then Ctrl+Alt+Shift+M) 
 - Remove double vertices (edit mode, W - remove doubles)  

If you would prefer to keep the text object, go to the object modifiers tab in the properties window, then try the following:  


add a decimate modifier
set the type to planar