Laila is wearing a four-wind hat, which is normally worn by men only in Lapland.
The body double in sex scene has had a Caesarean section. That's not in line with the story.
The Lapps are drinking Koskenkorva vodka during the WW II. The brand was brought to production no more than 1953.
The first encounter of Laila & Hans must have been in early 1945. After the war they fly to Helsinki with a DC8, which entered Finnair service only in 1969. At least 25 years must have passed but Leila & Hans haven't aged a bit.
The mountains depicted in the early scenes are clearly alpine. Lapland mountains are low and round.