The new house that Annie and Izzy move into in California is the same house that was used in Another Cinderella Story (2008) with Selena Gomez.
The only film in the franchise that both went straight-to-video and does not star Reese Witherspoon (though she does remain as producer). Witherspoon's character Elle Woods is mentioned several times though, and the twins are her British cousins.
The signature move of the twins, Flip and Wave, is a recreation of the Bend and Snap routine by Elle Woods from the first Legally Blonde (2001).
As indicated by the title cards given to each girl in the beginning of the film, one way to tell each of the girls apart is that Izzie (Becky Rosso) wears hot pink clothes while Annie (Milly Rosso) wears soft pink clothes.
The first, and only, film roles of twin sisters and actresses Becky and Milly Rosso.