Metro did an interview with Danish actor Nicolaj Coster-Waldau and he mentioned Jessica:
It was really surprising to see Jessica Chastain (playing Annabel in Mama) with a rocker look. How did she surprise you on set?
Her karaoke skills. They are brilliant. I, like the rest of the world, did not know much about Jessica until last year, when she came out in five movies. I had just seen Tree Of Life, so I could ask her what it was about, which was great. I saw The Help, where she is very different, and Take Shelter, which is a great movie. She is just a brilliant actress, and when you work with someone like that it just makes you better.