Very little violence at first - other than the plot, which hints at a sinister disappearance - but later there are guns fired, a man gets his thumb shot off, some people are punched in the face, and a big bomb goes off under a hillside.

A dog gets shot off screen. We hear a short squeal. In the next seen a brief glimpse of the dog's dead body can be seen.

Two dead and decaying bodies are found in a trunk.

'Fuck' (in all its various forms) is the main one used, several times per episode, and 'shit' (the Irish version) is used occasionally. 'Cunt' is spoken in an aggressive tone, typically as an insult, occasionally throughout the series.

Drinking in every episode, usually in pubs.

It's heavily implied that a character was abused by nuns as a child.