The pajamas that Lizzie and Miranda are wearing when they're instant messaging are designed by Paul Frank.
Miranda has a poster of Christina Aguilera on her wall.
In the "Lost Dog" poster montage, the original backing song was AC/DC's "Dirty Deeds Done Dirt Cheap", which more appropriately matched the scenes depicted. However, possibly because of royalty payments, the music was changed to generic instrumental music.
In real life Miranda and Kate would have been suspended for bullying and harassment. Lizzie also would have been suspended for starting the rumor depending on how strict her school was.
Kate's mother would have called Mrs. McGuire and Mrs. Sanchez in real life to let them know what Lizzie and Miranda did to her daughter. Lizzie and Miranda both would have been grounded for starting the rumor and harassing Kate. Mrs. Sanders would have grounded Kate for bullying Lizzie and harassing Miranda.