Does stockfish go easier on analysis when games are worse?

I've seen several games that I have played where when I make a terrible move its a blunder and my centipawn loss is huge.

Well, in this game (http://en.lichess.org/zb2JLzD0/black#57), this guy made several terrible moves and stockfish didn't call then all blunders. Like at the end when he dropped the rook, that was only an inaccuracy :)

My question: Does stockfish go easier the worse position the blunder is in? Or something like that?

yes because it really doesn't matter because the position is already won unless the winning side allows checkmate.

Aside from checkmate, the maximum advantage/disadvantage on Lichess is +/- 1000 centipawns. Your opponent was already 920 centipawns down, which then dropped to the maximum 1000 centipawns when he/she lost a rook. Therefore, the system marked the move as an inaccuracy because the move only lost 80 centipawns.

Also see this thread from a while ago for related information: http://en.lichess.org/forum/general-chess-discussion/highest-average-centipawn-loss-on-lichess?page=2#16