Grief is a leading theme. But the movie thrives in the idea of not letting life's hardships get you down and to always come back stronger and find the joy that still remains in the world. Characters show kindness -- even if they're initially reluctant to do so -- and are proud of who they are.
Tense scenes set in a London bomb shelter; aftermath of bombing shown (wrecked buildings, dusty people, possibility of death). Death of a parent occurs off screen; causes sadness. Reference to soldiers dying in combat. Character suffers a grazed, bloody knee after falling over as the result of being picked on by other children. A child falls into the sea and is seen flailing in the water -- but they remain unharmed. Arguments, yelling.
Brief bath scene, but no nudity. Two adult characters shown in a loving relationship; they have a strong chemistry, and sex is implied, but nothing graphic is shown.
Character tells children to "bugger off." A character sarcastically threatens a child while pretending to be a Nazi.
The lead character purchases cigarettes from a local shop in the opening scene and proceeds to smoke at regular intervals throughout the movie -- sometimes in front of children, and often while working.