“PwC takes full responsibility for the series of mistakes and breaches of established protocols during last night’s Oscars,” reads the new statement The accounting firm of PwC, which was responsible for the chaotic ending to Sunday’s Academy Awards when it gave the wrong envelope to Best Picture presenter Warren Beatty , has issued a second apology for its mistakes. “PwC takes full responsibility for the series of mistakes and breaches of established protocols during last night’s Oscars.