They called it a legal play though on the field when they called it a touchdown. They even huddled about it, determined it was still a legal play and a touchdown, and then spotted the ball for the extra point. Only after the league chimed in from New York did they suddenly determine it was not a legal play. They used an obscure rule, that most teams and fans have rarely ever watched be enforced, to take points off the board against the Lions. Had the officiating crew huddled once, determine it was not a legal play and overturned it at that point, it would be more understandable. They twice determined though that the play was legal when they didn't initially throw the flag and then huddled the first time and still didn't throw it.