Pamela Adlon was notorious for cursing during her recordings for Otto, so much so that Rob Paulsen and Mark Hamill often had to tell her to calm down.
It's go time!
During his explanation of the decay or "unraveling" of the past, Larry states that Henry Ford's Model T was the basis for all of the future's cars. In fact, there were quite a few other relatively light powered vehicles (gasoline or otherwise), such as the Stanley Steamer, that predate (and inspired) the Model T.
The Cartoon Network logo opens up to show Otto, Tuddrussel, and Larry inside; they activate their time machine transporter and disappear.