After Lisa solves the crossword puzzle to reveal Homers apology, the ending scene shows a ceiling view of Homer and Lisa and the living room. The paper with the puzzle has vanished from the floor where Lisa left it.
The word count of Homer's apology is not 144 letters, rather 149 letters with one hundred and forty four spelled out or 134 using numerals (with the use of no punctuation).
In Lisa's chalk crossword on the school playground, she writes PRACTICING when it should be spelt PRACTISING.