There isn't anything extra on the marriage but than all the entries are very basic.
Usually you would have to be Catholic to marry in an RC Church, often you will see an adult baptism in the same year as the marriage if one of the couple wasn't RC but I don't see one.(I only had a quick look)
People of course did what ever suited them so changing churches when they moved wouldn't be unusual.y
They may of course not originally be from Booterstown if her father's job involved moving around but Booterstown is the only clue you have so I would have a careful look there first.