Score: Man United 1 - 2 Man CityGoalscorers: Marcus Rashford 45' + 2'; David Silva 43', Nicolas Otamendi 54'Because of just how entertaining a derby it was, and because of its significance on the title race, we felt this shouldn't be restricted to 5 Talking Points.. so here's the story of the most important Manchester Derby for eons, through 10 Talking Points#10 Mistakes define the Manchester DerbyJose Mourinho has often described his footballing philosophy as one of minimising mistakes... when the Portuguese has a hard look at this game, he will be furious with the little mistakes that perforated the game - and so will Guardiola.While City's first goal was more to do with sheer luck, and good positioning from Silva, and less with any major mistakes on United's part, although it was Lukaku who headed it down to Silva - Mourinho will still be furious that his team conceded such a straightforward goal from a set-piece.On the second City goal, a silly foul from Herrera and an even worse clearance from Lukaku gifted the ball to Otamendi (Lukaku's right footed clearance smacked into the small of Smalling's back and rebounded).. and Mourinho will once again not be too pleased with the defensive nous of his big striker.Meanwhile at the other end, Delph's and Otamendi's basic failure to read a cross into the box led to United's goal ... while some will also argue that the referee's mistake in booking Herrera for a dive rather than Otamendi for a foul in the City box also had a tangible effect on the game.