Yes, the apostrophe rears its tiny little head again. This time it’s missing in the words “seats.” Many people have learned the simple technique of writing the sentence out in order to know where the apostrophe should go. In this case, the sentence would read “Every Seat is a Great Seat…”. The elimination of the word “is” requires the insertion of the apostrophe.
Having been in this restaurant during major (and minor) sporting events, their intended claim is true — there’s not a bad seat in the house.