Absolutely not, all the supplements, veggies, dairy products, etc., are completely unnecessary. You're right, the diet based on "raw meaty bones" designed by Tom Lonsdale makes much more sense than the "BARF" diet.
I feed what is called a "prey-model raw" diet, more closely based on Lonsdale's diet. It is also based on David Mech's research on wolves, which shows that wolves do not normally consume, or need, the stomach of the prey or its contents. The diet is simply 80% meat, 10% bone, and 10% organ, half of the organ fed being liver.
The only supplement that I would even consider would be Omega 3 (found in salmon or fish body oil). The reason I would consider this is due to the fact that the grain fed meat typically found in this country is very low in it. If you don't feed grass-fed meat, wild game, or deep ocean fish (such as salmon, sardines, anchovies, or mackerel), then a supplement would be a good idea to make up for the lack. However, my dogs get venison regularly and one or two sardines every week, so I don't worry about it.
If you've found out about the RMB diet you've probably seen some/most of these links, but they've been helpful for me so I'll post them for you anyway:
http://www.rawmeatybones.com/petowners/whatisrmb.php
http://www.rawmeatybones.com/diet/exp-diet-guide.pdf
http://www.ukrmb.co.uk/images/ww.pdf
http://www.rawfed.com/myths/
http://preymodelraw.com/how-to-get-started/
http://pets.groups.yahoo.com/group/rawfeeding/
http://dogfoodchat.com/forum/raw-feeding/
That third link is actually a free PDF copy of Lonsdale's book "Work Wonders". It's definitely worth the read.
Anyway, hope that helps, and good luck with your dog's (or cat's) transition to a raw diet!