in the episode where the rugrats go the bingo night at the senior center there are a couple slip ups...one of them is that the caller calls the number I2 (not O2) ...if u know about bingo u know that the number 2 is under the B section...another slip up is when grandpa said he only needed one more number to get a bingo...if u look at his card...he already has a bingo
I also had to mention that the caller called the number 2 twice. First O-2 then I-2. Of course the number 2 is never called twice and never appears in the I or O columns of a bingo card.