When Joanna has a breakdown and hides in Alan's cupboard after he kills her cousin, she refuses to leave. Alan then says, "I'll look after you." Considering all the crap Joanna has put him through, it's a genuinely sweet moment.
Statham singing some Lionel Richie down the phone to Boyce in the final episode.
Guy doing the right thing and backing off from Caroline, encouraging her and Mac to go for it instead.
The entire scene when he's trying to tell himself to do something nice. He's staring at a glass of beer (representing what he wants, aka. Caroline) and a glass of wine (representing what's right, aka. Caroline and Mac being together). Even though he goes after the beer time and time again. He keeps trying.