Slappy was cited as the release that Green Day began to find their sound, as said by Billie Joe Armstrong. The EP was recorded in only a few hours on April 20, 1990 at Art of Ears Studios in San Francisco, California. It was also mixed in only a few hours on April 23.
The dog on the cover art was known as Mickey, and his nickname, "Slappy" was given by Jason Relva.
The second track on side two of the EP, Why Do You Want Him? was written by Armstrong when he was fourteen. 409 in Your Coffeemaker was about a prank Armstrong pulled on a teacher. Knowledge is a cover of the song by Operation Ivy, which is still often played live with fans.
Every track off the EP were later included on the 1,039/Smoothed Out Slappy Hours compilation album, released in 1991.
The EP remained in print until Green Day removed its releases from Lookout Records in August 2005. It was later put back into print in March 2009, however the art work was now tinted pink instead of its original dark red colour.
|1.||"Paper Lanterns"||Billie Joe Armstrong||Andy Ernst · Green Day||2:23|
|2.||"Why Do You Want Him?"||Billie Joe Armstrong||Andy Ernst · Green Day||2:31|
|3.||"409 in Your Coffeemaker"||Billie Joe Armstrong||Andy Ernst · Green Day||2:54|
|4.||"Knowledge" (cover of Operation Ivy song)||Jesse Michaels||Andy Ernst · Green Day||2:19|