Listen here: When Sean Paul Ellis and myself were looking for a Thanksgiving cartoon to review for this week's episode of Saturday Mourning Cartoons, we returned to Rankin/Bass, the classic production studio behind such stop-motion holiday specials as Rudolph the Red-Nosed Reindeer and Frosty the Snowman. What we found was The Mouse on the Mayflower, a traditionally animated made-for-TV movie that revisited the famous story of the Mayflower Compact, the pilgrims that signed it, and the first Thanksgiving. But we found a lot more going on behind the scenes. This animated special, which travels …