Clarence Seedorf, Gianluca Zambrotta, Alexandre Pato and Kaka struck for the under pressure Rossoneri and Ancelotti revealed: "The difference was we tried to play with more depth and movement, spreading the play, and I think we did it well. There was less close passing and more pace.
"We have been playing this way for many years and when Marco Borriello or Pippo Inzaghi are fit, they provide the ideal centre-forward characteristics. Unfortunately they've not been fit recently so we had to find alternatives.
"Milan are an attacking side and will always take risks at the back. Our only real error tonight against a quality team was leaving ourselves exposed on what was our own corner kick."
This result follows on from Thursday's 3-1 UEFA Cup victory over Zurich, so Ancelotti's job is once again safe.
"I don't know if the negative period is over and I say it isn't because we cannot be complacent. Everyone took on their own share of the responsibility without seeking a scapegoat.
"What Kaka said was probably right, as we all perhaps put too much faith in the great talent of this team and forgot that to play football you need organisation and hard work.
"Everyone was very aggressive and co-operated to ensure the squad worked at its best. There were definite improvements in defence because everyone else helped to win back the ball.
"It was a general attitude. Today the team was running and last week against Genoa they looked static. So it wasn't just a fitness issue, one has to run in an organised fashion, or you end up wasting energy."