Broken Base: Sort of a minor and strange version, considering the band's past albums. When they released the pro-union song "Take 'Em Down", some fans said they didn't like the band's new "political direction". Other fans however, not only embraced the song but let the angry fans go.
Covered Up: "I'm Shipping Up to Boston" and "Gonna Be A Blackout Tonight" are Woody Guthrie songs. Both are interesting examples of this because Guthrie never recorded either song. (He left behind dozens of unrecorded songs, and many of them had already appeared on Wilco and Billy Bragg's Mermaid Avenue albums in the early 2000's)
Face of the Band: Ken Casey, the bassist. Sort of odd, but considering he's the sole original member...
Growing the Beard: sometime after Al Barr became the vocalist the band started to blend their genres better, and got a bit more complex musically. Blackout seems to be the point most people pick.
"Fields of Athenry," a traditional Irish song about a young man being sent to Australia for theft after stealing food to prevent his children from starving during the Potato Famine.
"Green Fields of France," sung from the POV of a tourist speaking to the grave of an Irish soldier killed in WWI.
"Broken Hymns" tells about a soldier in the American Civil War killed at the Battle of Shiloh. The lyrics dont specify if he fought for the North or South, and the mention of his mother in Brighton could refer to towns in Massachusetts, New York, or South Carolina. This is likely intentional, as it could refer to both sides.
"4-15-13" commemorates the victims of the 2013 Boston Marathon bombing.