- Dove Cameron as Liv and Maddie Rooney
- Joey Bragg as Joey Rooney
- Tenzing Norgay Trainor as Parker Rooney
- Kali Rocha as Karen Rooney
- Lauren Lindsey Donzis as Ruby
- This is one of few episode in season 4 where the airing number does not match the production code.
- The alternate title was Mouth-Candy-A-Rooney.
- Sing It Louder tries to pull of a live episode called Sing It Live.
- Liv has to have surgery in the episode and is faced with possibly not being able to sing again.
| To view the Sing It Live!!!-A-Rooney gallery, click here.