According to Allan Ball, the end credit scroll is slower than usual as a tribute to the show's greatly appreciated but under-acknowledged crew.
In every episode, the end credits appear in white lettering over black. This is the only episode in which the end credits are in black lettering over white. This is also the only episode after the second season which features rolling credits as opposed to title cards, and the only episode in which all of the end credits are in scroll (seasons one and two feature a mix of cards, followed by a scroll).