When the final episode was produced, there was about a 50/50 chance of it being the last episode. Because of this, the staff chose to loosely resolve the show, but left it open in case production continued.
The opening sequence starts with a message that says "See you on some other channel". This was done in fear that Fox was going to cancel the show, and this would be the last episode. As it turns out, that's exactly what happened, and just like this statement predicted, the show was later picked up by "some other channel" when Comedy Central ordered more episodes.
The Robot Devil spins a large wheel featuring the names of various robots. As it spins, the following names are visible (In order): Robot Devil, Billionairebot, Flexo, Daisy Mae 128K, Crushinator, Roberto, Helper, Kwanzabot, Robot I-X, Clamps, Hedonismbot, Fatbot, Linctron, Destructor, Santa, Joey, Tinny Tim, Chain Smoker, Angleyne, Execu-tor, Preacherbot, Fembot, Hair Robot, Unit 2013, Donbot, Boxy, Lulubelle 7, Humorbot 5.0, Calculon, URL, Foreigner, iZac, Cartridge Unit, Barkerbot, Teenbot, Gearshift. Q.T. McWhiskers, Deep Blue, iHawk, Cylon, Patchcord Adams, Liubot, Stage Mom 7.0, Sinclair 2K, Vending Machine, Oily, Coolometer, Andrew, Monique, Rab-bot, Lisa, Executive Gamma, Keg Robot, Greeting Card, Eurotrash 80, Nannybot 1.0, Emotitron Jr. (Displayed as: "EMOTITROM, JR."), Ceiling Fan, Hookerbot, Bender, and Robot Devil (Again - as, apparently, it rotates full circle). Fry has met or come into contact with a great deal of these robots, going against what the Robot Devil said about Fry "definitely probably" not knowing him.
This was the last episode broadcast on Fox.
The title of this episode is a turn of the phrase "Idle hands are the Devil's playthings" which is often used to illustrate how people, usually kids, that have nothing to do often turn to doing bad things for entertainment.