All of the family & guests at Allison & Bud's wedding are wearing either a shade of blue or a shade of coral. Robert, Sol, Mallory, Barry, Nick, Dan, Vince (Allison's dad), Joan-Margaret, & Allison's grandmother are all wearing shades of blue. Frankie, Brianna, Coyote, Goldie (Allison's mom), & the Rabbi (reception only) are all wearing shades of coral. Madison & Macklin are wearing a mix of blue & coral. Grace is the only main character not wearing either blue or coral. She wears a cream colored dress.
The wedding cake Grace gets for Bud and Allison's wedding contains similarly designed tiers as the one shown in the intro.