Oh, Promise Me - S4.E22

A check of their their marriage license revals that Oliver and Lisa aren't husband and wife. They'd been mistakenly given a license to practice dentistry. Refusing to stay in the house with a bachelor dentist, "Dr. Gronyitz" moves in with the Monroe brothers until they can re-tie the knot. Their church wedding goes fairly smoothly considering Hank Kimball is the best man and Ralph Monroe is the maid of honor.