I did the Elly and Ryoko weddings and I didn't notice anything new in the room like the pictures of Mira and Vampire, or the weapons for Sandra Tsubaki and Mirel. I did notice that Ryoko stays in her wedding dress now but I couldn't find any difference for Elly.

For Elly, the tea set in the bottom right of the room turns into alcohol bottles.

For Ryoko, a plate with meat (a cooked swine) appears on the table in the top left.