On Tuesday, a caller revealed the mistake to Triple M's Hot Breakfast program.
The error apparently appears on the left of the note, in tiny text under the image of the King Edward Memorial Hospital.
Edith Cowan, a social reformer whom the note honours, helped establish the women’s and maternity hospital in Sydney.
"I stand here today in the unique position of being the first woman in an Australian parliament. It is a great responsibilty," the text reads.
The word responsibility is missing the final 'i' in the Edith Cowan speech.
The speech appears more than once on the note and the word is reportedly misspelt each time.
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