This article is from the NARF--The Nifty Animaniacs Reference File FAQ, by Lee Cremeans wakky@yakko.wtower.com with numerous contributions by others.
For episodes 66-69, the line is "We've got wisecracks by the stacks".
The bit of animation replacing Bill has been taken from a song break
in "Taming of the Screwy".
For episodes 70 on, the line is "We pay tons of income tax", and has
new animation. As well, the lines "Meet Pinky and the Brain who want
to rule the universe" are replaced by "Meet Ralph and
Dr. Scratchansniff, say 'Hi' to Hello Nurse".
 
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