Dont worry about it, I have put the B/G's name from another wedding on the entire project. ( I was working on 3 at the same time)

I give the B&G a "draft" copy with "Draft" text along the bottom of the screen to go over with a fine tooth comb for spelling errors etc. They have a week to do this. I have thus far avoided any spelling mistakes...on the final copy that is.

I have deliberately cut back on the amount of titling I include to reduce the risk of this happening. I have even gone as far as using first names in the title and no one has mentioned it. I include samples of weddings using only first names in my demos so they know what to expect.
Another thing I do is request an Invitation to refer to. The only problem is that one time it was spelled wrong on the invitation and the bride didn't notice it until I pointed it out.
I also have seen invitations that had such crazy fonts that you couldn't read them!