Factual error: The boat from Ireland to America has the sun high in the sky (i.e. in the south) but the boat is travelling the wrong way for this to happen. The way it is shot, the sun is in the north - which is an impossibility. (00:11:00 - 00:12:00)
Factual error: The year is 1952. In an exterior scene, Saoirse Ronan is seen on a street in Brooklyn. In the far background, a red "WALK/DON'T WALK" sign is flashing. This type of sign was only introduced across NY in the late 50s.
Factual error: It's springtime in the movie (Eilis met Tony after Christmas and it's not yet summer, when they go to the beach) and Rose is sitting reading Eilis' letter and eating an apple. Nope. Apples are fall crops, and even if somehow Ireland - still very poor, and still a place where people went shopping with ration coupons - could have had apples in spring, Rose was not wealthy and would not have had one.
Factual error: At the end of the movie Saoirse Ronan enters the US through the US Citizen's lane. After being married for 1 month she would not have yet qualified for citizenship.
