I have a tendency to forget all of the options that I want to use when making a bootable DVD image with mkisofs so I'll post it here.
Set $LABEL to requested volume label. Set $ISO to the full path to the requested ISO. Then run the following command from the directory containing the DVD's file system.
mkisofs -b isolinux/isolinux.bin -c isolinux/boot.cat -hide-rr-moved \ -no-emul-boot -boot-load-size 4 -boot-info-table -R -J -T -v \ -V $LABEL -A $LABEL -o $ISO .
mkisofs -hide-rr-moved -R -J -T -v -V $LABEL -A $LABEL -o $ISO.