Sondheim's picture showed through a cutout in the front - you could also show it with the complete Hirschfeld drawing with Frank in the center square (which was the front page of the enclosed lyric book). On the record jacket with the Sondheim square were also a bunch of photos from the production. The back cover of the LP had the window card design.
Now I remember why I was never impressed. When the recording came out I didn't buy the LP. Instead I bought the cassette tape which of course didn't have all these features.