Pain in Spain prompts Ancelotti call for video refsSports | Apr 20, 2017
Cristiano Ronaldo scored a hat-trick to become the first player with 100 Champions League goals as Real completed a 4-2 win in Spain to reach the semi-finals 6-3 on aggregate.
However, Ronaldo's second and third goals were offside, while Bayern's Arturo Vidal was sent off five minutes from the end of normal time.
"We deserved more," fumed Ancelotti. "There are decisions that have penalized us a lot ... so clearly we are not happy.
"In a quarter-final you have to put a better referee or introduce video refereeing, which is what Uefa are trying, because there are too many errors."
Bayern threatened to overturn a 2-1 first-leg deficit as Robert Lewandowski's penalty and Sergio Ramos' own goal either side of Ronaldo's first took the game to extra time at the Santiago Bernabeu.
However, Bayern suffered after Vidal saw his second yellow card and Ronaldo made the most of an assistant referee's leniency to complete his hat- trick. Marco Asensio rounded off the scoring.
"If the referee didn't make mistakes we don't know what would have happened," said Ancelotti, back at the Bernabeu for the first time since he was sacked in 2015.
In England, Leicester City's fairytale came to a valiant end following a 1-1 draw to Atletico Madrid.
Seeking to overturn a 1-0 first-leg deficit, Leicester fell further behind to Saul Niguez's first-half header, before Jamie Vardy's 61st-minute strike gave them hope.