I suspect the freeze frame was the original ending, and someone meddled!
I too have noticed that this tendancy to over egg the endings of films (AI being a classic example) is endemic in Hollywood these days, & is a pain in the ass! So many film have neat, natural endings that just dont end up being the final scene... I suspect its the desire to leave the audience wanting more that adds these complex & unanswered endings we see so often. To me its a bit showy offy: Look how clever we are!
I loved this film, but for me I saw this ending differently. In fact,