Last season, United were cruising to the Premier League crown at the end of April.
But it all went wrong as they surrendered a two-goal lead at home to the Toffees in a 4-4 draw.
United defender Rafael said: "It was an unbelievable game. It was tough for us because maybe it cost us the league.
"But we'll definitely learn from it. We scored a lot of goals but conceded silly goals ourselves.
"We can't concede two goals at the end like we did."