Besides having different smoke points, what are the differences between grape seed oil and olive oil?

Correct:  Grapeseed Oil does have a higher smoke point than Olive Oil.  Another difference is in taste.  Grapeseed Oil has a mild or neutral flavor versus the "fruity" distinctive flavor of olive oil.  Many people prefer to use grapeseed oil for cooking as because it is neutral in flavor.

 Olive oil and grape are practically identical in terms of nutritional content. One tablespoon of both olive oil and grapeseed oil contain approximately 120 calories, 1.8 grams of saturated fat and 9.7 grams of unsaturated fat. Both of them are cholesterol-free, hence make for a relatively heart healthy oils. Both grapeseed oil and olive oil contain Vitamin E known for its antioxidant properties, but grapeseed oil contains more Vitamin E as compared to olive oil. Grapeseed oil contains 3.8 mg Vitamin E per tablespoon and olive oil contains 1.9 mg per tablespoon.