There were 56 confirmed Walker kills in this episode.
As stated in the episode, the song that Beth and Maggie sing is called "The Parting Glass". It is a traditional song from Ireland and Scotland that has existed since at least the early 1600's and is sung at the end of gatherings.
Rick Grimes: Only one way to keep you alive.
(chops off Hershel's leg)
Viewership: 10.9 million (top show on cable on October 14th, most viewed episode for the series)
Starting with this episode, Lauren Cohan (Maggie Greene) is main cast member.
Original International Air Dates:
United Kingdom: October 19, 2012 on FX/FX HD
Latin America: October 16 , 2012 on FOX/FOXHD
Finland: October 21, 2012 on FOX
Sweden: November 4, 2012 on Kanal 11
Slovakia: March 14, 2013 on JOJ Plus
Locations: The Prison is a set built in Senoia, GA.
The ESCO Feed Mill and Deer Cooler store in the new opening sequence is in Harlenson, GA.
The building that Michonne finds the aspirin inis also in Harlenson, GA.
As Carl searches the kitchen for food at the beginning of the episode, he handles a can of 'SMEAT'. This is a parody of SPAM, but this prop was used in the post-apocalyptic film 'Water World' as the foodstuff of choice of the piratical Smokers.