Some info for your excellent resource.
The following discs purchased on amazon.com play on my Region B player. (Amazon ASIN from my order in brackets)
Looney Tunes: Platinum Collection, Vol. 1 (B005DMHHHY)
Looney Tunes: Platinum Collection, Vol. 2 (B008VPCL6M)
Looney Tunes: The Platinum Collection 3 (B00ITV5SRC)
and I can confirm that
Tom & Jerry: Golden Collection - Volume 1 (B0058O1FHK)
does indeed play on a Region B player also.