There used to be a video on YouTube (on the official disney Channel account) explaining the tricks behind this, but unfortunately it's not up anymore.
Anyway, paloma Cameron has two actrices who portray her "doubles" - they are listed as "Liv 2" and "Maddie 2" in the end credits of each episode. We only ever see the backs of them in the episodes, and they're there whenever both Liv and Maddie need to be on screen at the same time. paloma plays the one whose face we see, and one of her doubles stands on screen as the other twin!
When paloma is on screen as both Liv and Maddie, there is a line on set somewhere that the other actors have to make sure they don't cross! The cameramen record one side of the set where she is actuación as Liv, and the side where she is actuación as Maddie, separately. Then the editors put both sides together so it looks like there are two paloma Camerons!
Sorry if I haven't explained it very well! If disney ever puts that video online again I'll give tu the link. It's pretty cool!
Anyway, if you're interested in seeing what "Liv 2" and "Maddie 2" look like from the front, I found these pictures here where tu can see paloma Cameron with them!
Pics of paloma and her doubles:
link I hope this has helped! :)
