THE DIFFERENCE BETWEEN XX

What's the difference between:

1. A horse trail and a woman preparing for marriage?
2. A doctor and a groundskeeper?
3. The Great Stone Face and the Battle of the Little Bighorn?
4. A slowpoke and a hat?

Answers:

1. One is a bridle path and the other is a bridal path. 
2. One makes rounds and the other rakes mounds.
3. Buster Keaton and Custer beaten
4. The slowpoke has to catch up but the hat goes on ahead.