A Rabbi's daughter is raised to a life of chastity and modesty. She would certainly not be as yielding after waking up naked in a strange man's bed, especially not a week before her wedding.
Rachels' robe is red. Red is considered the color of passion, therefore red clothes are never worn by orthodox Jews.
Rachel and Bernard's wedding ceremony wrongly and awkwardly mixes Christian and Jewish elements.
At the beginning of the movie the first rifle you see being held has no bolt in the chamber making it useless.
During the 12th minute - 12:24, 12:37 and 12:50 the sound boom is clearly visible in the top left of the screen - surprising to see with two people alone in a hut in 1939. Between 28:45 to 28:54 - the same thing again when the parents are have arrived for a chat - the sound boom is back. And again during the wedding scene in the barn 46:39 to 46:52 - the sound boom is there with the happy couple.