This isn't really a spoiler, espcially since we are now 3 weeks past the finale. This is a reference back to Episode 5, Mozambique, where there were the amazing rats. Those rats are going to be on FRONTLINE/WORLD I believe nationwide on PBS Tuesday June 26 at 9pm as one of 3 segments. This segment is "from Mozambique, where trained rats save lives discovering landmines." In the New York metro area, it's on Channel 13.