James Garner greatly enjoyed his late in life role in the show, especially working with such a young and vibrant cast. In his autobiography he paraphrased General Douglas MacArthur's comment on the Korea War describing his casting as "A great gift to an old campaigner'.
In episode 4 of season 1, a situation has Cate putting her hand on Paul's chest to feel his heartbeat. She tells him that his heart is fine. Ironically, John Ritter passed away after making only 3 episodes of season 2. Aortic dissection.