When Ian is being baptized into the Greek Orthodox Church.
Toula: He's gonna look at me and say "you're so not worth this!"
Nick:Yes you are.note Nick spends most of the movie up until this point behaving very immaturely, so to hear this from him is a sign of Hidden Depths
At the wedding, when Gus hands over the wedding gift from him and Maria, and Toula opens it to reveal that they have bought Ian and Toula a house. It shows how much Gus has grown, and his acceptance not only of Ian, but of Toula's choice.