There was this little controversy where people believed that Bloo actually said "You pissed him off, that's what's happening!" However this is 100% false as FHFIF is not the kind of show that would present these kinds of language to a kid-oriented show. The trouble came from the Caption ability that comes from the TV's to deliver automatic subtitles. Originally Bloo yells: "You peeved him off, that's what's happening!" But it seemed that the caption ability did not recognize the real word Bloo yelled which could be due to the high volume from the feature when World got angry at Herriman so it believed Bloo said the other word instead.

Although another reference to profanity comes earlier to the feature when the gang looks for Frankie and finds her "written" honest thought about Herriman. Although you won't see clearly what it says, but when Eduardo reads it he reads: "Mr. Herriman is a big fat..." Then Wilt censors it, this could possible be a reference to the f-word.