1. Don’t you need to get permission to reprint a full review? Can’t imagine that they got it so soon.
2. Don’t people check the new ads coming in before they’re printed?"
1. It's far easier to ask forgiveness than it is to obtain permission.
2. It says in the article that they made sure to deliver the ad copy 5 minutes prior to deadline. While it's highly unlikely that no one signed off on it, it's possible that it wasn't highly scrutinized.
Well, the producers continued being savvy as this 1976 TV commercial for the Broadway production of GREASE proclaims it “the longest running show on Broadway.” GREASE didn’t break that record until 1979 - 3 years later.
NOTE: you’ll spot in the TV commercial - Marilu Henner as Marty (she created the role in the original 1971 Kingston Mines nightclub production in Chicago), and Mimi Kennedy as Jan (fresh off the national tour).