This is utter b*llox from Mourinho although granted they were hard done to yesterday particular;y with the challenges by Barnes. I've seen both penalty decisions given but they would both have been harsh.
That said the poor decisions we have had this season that have directly impacted the game, from memory
Arsenal (a) first goal blatant push on Di Michealis, 2nd goal blatant foul on Aguero -2 points
Chelsea (h) Zaba sent off against the rent boys despit being assaulted by Costa -2points
Stoke (h) Yaya denied blatant pen -1point (no gaurantee we would have won)
West Ham (a) offside goal and imo blatant pen not given but barely mentioned -1point
Southampton (a) Aguero most blatant pen not given (albeit we still won)
Burnley (h) first goal offside -2points
Sunderland (h) I thought their first 'goal' wasnt a penalty (albet we still won)
Arsenal (h) first goal a penalty given for 'impeding an oponent' (formerly known as obstruction) which is acually an indirect free-kick not a direct free-kick ie a penalty -2points
Hull (h) blatant push on Silva no penaty given -2points
The above would turn a 5 point deficit into a 6point lead.
Funny how these poor decisions that Mourinho moans about only happen to occur when they lose points.
Costa could and should have been sent off 3/4 games this season. Liverpool was where he did so much that to turn a blind eye would havee been laughable.