I think what the problem here is a mis-communication between the photographer and the bride. She wanted a DVD slide show, and he thought she just wanted in archived on a DVD disk.
If you just put a folder full of images on a DVD disk, it won't play a slide show in a consumer DVD player. You need to author the slide show, then burn to DVD. There are several programs available to do that on both Mac and PC, but it's an extra service, and should be charged for.
David Buzzard