Can a penalty be called without a flag being thrown. I saw a game yesterday where a punt returner muffed a punt on 1 yard line. he recovered it tried to run, got tackled in the end zone. Ball was spotted at the 1 yard line. then officials huddled up, and then the white hat announced fair catch interference on kicking team. No flag was ever thrown, but they marked off the yardage. If it was interference, why didn't someone throw a flag.