"Unacceptable" and "the thing, the thing" have both made it into the show; both are lines from the Adventure Time (2010) character The Earl of Lemongrab, also voiced by Justin Roiland.
Oh, what have we got here? A bunch of people with their faces stuffed in Computers? Don't you realise that Christ was born today? Don't you realise that Christ our Saviour was born today? WHAT KIND OF CHRISTMAS IS THIS?
Mice are colourblind.
There is a scene based on what happened earlier is shown at the very end of the credits of most episodes.
The DVD/Blu-Ray releases un-censor all cursing/profanity from episodes that are bleeped in televised airings.