Mitchell Rathgeb actually dyed his hair for the later scenes. The colour was supposed to be bright blue and not sea foam green.
The little dog on the Narrator's lap wasn't in the script. He belongs to Mitchell Rathgeb's sister and the crew thought he would be a funny addition. The dog was included in shots where he managed to stay still.
The words that Robyn and Jonas scream at each other are actually in Uzbek and not Yiddish. Fran Kohi served as the local Uzbek tutor.