| Episode credited cast: |
 | Jay Leno | - | Himself - Host |
 | Rickey Minor | - | Himself - Bandleader |
 | Christina Aguilera | - | Herself - Guest |
 | Paul Reiser | - | Himself - Guest |
 | Alison Krauss | - | Herself - Musical Guest |
 | Union Station | - | Themselves - Musical Guest |
 | Jerry Douglas | - | Himself - Musical Guest |
| Rest of cast listed alphabetically: |
 | Justin Bieber | - | Himself (archive footage) |
 | Catherine Duchess of Cambridge | - | Herself (archive footage) (as Kate Middleton) |
 | Prince William | - | Himself (archive footage) (as Prince William Windsor) |
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