In addition, one of the later-redubbed episodes ("Growth Spurts") had a new minor edit covering over a minor mention of "Kick Ass" to just "Kick", obviously because of minor cussing in a children's TV show.
And on top of that, there were actually several episodes left unfinished, due to the show's cancellation. Three episodes, one being the history of robotics, one about Robot Jones going on the "Soapy Winfall" talk show, and an unknown episode (as he cites "it was so long ago I forget...") were storyboarded but never animated. It can be assumed that the first episode ("History of Robotics") could have revealed more of Robot Jones' family.
There are two episodes that are uncomfirmed to have existed: "Risk" and "Robot Grafitti". A fan once posted a theory (not knowing anything about scrapped episodes, only from watching a banned Ren & Stimpy episode "Man's Best Friend") on Wikipedia that these two episodes were believed to be banned by Cartoon Network from airing in Season 2 as the fourteenth episode for containing excessive violence, harsh language, and sexual and/or scatological jokes, but this is entirely false info-- The real mystery behind these two episodes is whether they were scrapped and/or if they were finished or not.
On a Toonzone forum, someone posted that there is an unaired Halloween special for the show, but so far, no physical evidence of this has been put forward, so this episode's existence remains unconfirmed.
And finally, according to a FaceBook interview with show creator Greg Miller, it is clear that the planned series finale involves Robot Jones exterminating the human civilization and ruling the planet, but unfortunately before this could be revealed, the show was cancelled, making "Rules of Dating" the last episode of the show (even that one wasn't actually intended to be the actual series finale in the first place).
So while it's just barely possible to find all of the episodes in varying degrees of quality, it's even more difficult to find all of the original cuts of the episodes. As for the never released audio and episodes, Miller claims to be in possession of VHS copies of work prints of the Season 2 (and maybe pre-Season 2) episodes with the original voice floating around somewhere, and while it apparently may be difficult to get any storyboards or concept art of the show from Miller, storyboards from the aforementioned talk show episode have been made available online from Chuck Klein's blogspot.
3 episodes using the original audio were uploaded to YouTube, making the total of episodes recovered up to 4; the uploader, CartoonArchive has stated that he may own more episodes using the original voice, but it is unknown. Additionally, on the exact same day, YouTube user '1mjusth3r3' uploaded some commercials from the show in its early days that also use the original voice.
Good news if you wouldn't know it, SuperPowerpuff2061 (known as Bigfatloser86 on deviantART) has uploaded all of the Season 1 with the original voice onto Dailymotion (including the uncensored version of "Growth Spurts" whose video source derives from the recently uploaded Portuguese dub on YouTube), using video sources from the same videos uploaded from before but dubbed with audio taken from low-quality camera recordings of the original episodes uploaded by NickDanielsen on Vimeo. Hallelujah for all the RJ fans who always wanted all the Season 1 episodes with the original voice.