We see the buttocks of a boy. This is in two scenes, the second of which is somewhat extended and shows rear nudity for multiple boys.

We also see a very, very, brief glimpse of a young boy's genitalia from behind. It's so brief that it's much easier to miss completely than to catch.

We see several boys being pushed, slapped and caned by teachers.

Billy gets into violent arguments with his brother and mother, in which they push and shove.

Billy gets into a fight at school, and they fall around punching and kicking each other.

One mouthed F-word; a man can be seen mouthing "you fucking twat!" to a boy (it's barely audible, but it comes up in the subtitles). In the undubbed version, there is another instance where Billy shouts "thou's a big, fucking bastard!" at Jud towards the end of the film, which leads his mother to say, "That's enough of that language." In the dubbed version, this is replaced by "thou's a big, bloody bastard!"

A man is seen making an obscene hand gesture (shaking his hand, miming masturbation). In England and Commonwealth countries, this is often a sign of calling someone a "wanker" or "tosser."

Several uses of "bastard."

"Twat" is used a few times.

"Damn" is used a couple of times.

"Hell" is used a few times.

"Bloody" and "git" are used several times, although "git" is said as a homophone of "get" in this dialect.

Teenagers are punished for smoking.

We also see an older teenager smoking.