Jessica Capshaw ("Arizona") became a regular, and was added to the opening credits, while T.R. Knight ("George") was removed from them.
Actual funeral programs were printed for the funeral scene to make it as realistic as possible for the audience.
Although Katherine Heigl was credited as a main character in the first 18 episode of Season 6, she only appeared in 7 episode. (Episode 1-5 "Good Mourning"-"Invasion", Episode 9 "New History", and Episode 12 "I like you so much better when you're Naked"
Every episode of the show is named after a famous song. "Good Mourning" is a song by Talib Kweli and Hi-Tek.