The calendar prominently seen on the wall of Sandy's kitchen never changes from June 1960, even though an obvious amount of time passes during the interim.
When Sandy and Tolly are talking while she is tending to his injury right between them is a calendar. The month and year on the calendar are December 1939 with the first day of the month being on Tuesday. In actuality the first day of December in 1939 was on a Friday.
The opening sequence takes place in December 1939, and Tolly is 14 years old. The bulk of the story begins in June 1960 and takes place immediately thereafter. Sandy comments to Tolly that he's 32 years old now.
The scar on Cuddles' face disappears and is never seen again in any of the following sequences.