What I noticed was that many times both were singing without looking at their programs. THEY knew the words by heart. They've sung them before and attended services more than just Christmas and Easter when other hymns would have been sung. (IIRC Kate sang in the choir for a while)
Except when the Bishop mentioned the "Holy Ghost." The Catholic Church decreed from the Vatican years ago that the term "Holy Spirit" would be used instead.
Anglicans believe everything Catholics believe---except they do not recognize the Pope..... thanks to Henry the eighth.
Now there are talks between Anglicans and the Vatican seeking rapprochement......being connected once again to Catholicism.
Maybe Catholic might even get back to the lovely custom of wearing hats to church.