One of my favorite examples of lack of proofreading in the newspaper:
About forty years ago, the Fort Worth Star-Telegram, a paper not known for Pulitzer winners, had the following phrase for a night of college basketball games in New York. It came out as the "Madison Square Garden F--- You Classic".
Of the handful of callers who phoned the Star-Telegram to complain, one asked, "Is this what you print in your newspaper?" The ombudsman replied, "You should have seen what was in there before we cleaned it up."