The scenes with Amy, Elly, Chloe and Ely's sister (forgot her name) and Mal are new. The scenes with Izzy and Shane are original from last year. I saw something on instagram about how they filmed the scenes with Holly looking around corners watching them and edited to mix that into the earlier scenes to make it look like she was there.
I forgot how much I like Mal! I wish he would come back and be a regular character. And Libby, I always liked her. The Kennedy clan could spread out on Ramsay St if they returned.
Also noticed today how incredibly short Holly is! She was wearing giant heels but still only a fraction of her co-actors height.