Jay Leno is a man of his word. The comedian, 74, is the official caretaker for his wife of 45 years, Mavis, after she was diagnosed with dementia and he was granted conservatorship over her last year.

Leno's return to the "Tonight Show," which he hosted for 17 years, boasted a battery of A-list guests and cameos, including Jamie Foxx, country music star Brad Paisley and Olympic gold medal skier ...