| Episode credited cast: |
 | David Letterman | - | Himself - Host |
 | Bill Murray | - | Himself |
 | Viva Brother | - | Themselves - Musical Guest (as Brother [UK]) |
| Brian Miser | - | Himself - The Human Fuse |
 | Paul Shaffer | - | Himself - Musical Director |
| Rest of cast listed alphabetically: |
 | Catherine Duchess of Cambridge | - | Herself - On Balcony After Wedding (archive footage) (as Kate Middleton) |
| Dave Johnson | - | Himself - Phone Interview (voice) |
| Alan Kalter | - | Himself - Announcer |
 | Prince William | - | Himself - On Balcony After Wedding (archive footage) (as Prince William Windsor) |
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