2. Baby Lily was played by twins
image source: thr.com
Television shows often have to work around child actors, because of the number of hours that the children can feasibly work. Of course, since the days of Full House, television shows have been getting around this by using twins to play one role.
Mitch and Cam, on the show, adopted a little girl by the name of Lily. She was originally played by Ella and Jaden Hiller, two twin girls, before Aubrey Anderson-Emmons was cast as the new Lily.