Cranberries contain a massive amount of natural pectins. They will gel all on their own, which is why you can basically make cranberry sauce out of filling.
Alton BrownButter typically melts around, you know, 90 Fahrenheit, as opposed to about 20 degrees higher for lard. So what that means is that when you're working with it, the lard is going to stay more solid, which is great for flakiness.
Alton BrownLast year, I made a refrigerator in my basement. And I needed to because I needed to figure how - you know there is no such thing as 'cold.' There is only less heat.
Alton Brown