Thank God It's Doomsday/References

References/Trivia

Cultural References

The title is a reference to the popular saying, Thank God It's Friday.
The song playing when Homer is throwing away his books on the Rapture is Three Dog Night's version of "Easy To Be Hard" from the musical Hair.
God's chair is a Aeron chair manufactured by Herman Miller of Michigan.
Among the deceased seen in heaven are Leonardo Da Vinci and Dean Martin.
Charlie Brown is shown for the fourth time. The first time he was seen in his ghost costume in "Treehouse of Horror II", the second time a candle version of him was seen in "Grade School Confidential" and the third time as a costume in "Treehouse of Horror XIV".
The song played as Homer enters heaven is "The Flower Duet" from the opera Lakmé by Léo Delibes.
The clock labelled Heaven is on UTC or UTC+12 relative to the other clocks labelled London, New York and Tokyo.
When God turns backs time, he exclaims "deus ex machina". This literary machinism is used ironically because it means "God from the machine" and refers to an inexplicable resolution to an unsolvable problem--which are both elements of what happens in the episode when the Apocalypse is undone.
The scene at the end of the episode, where Homer and his bar pals are sat drinking, resembles the Last Supper painting by Leonardo Da Vinci, with Homer posing as Jesus.