Paul Pogba admitted his "attitude wasn't right" in Manchester United's defeat at Brighton, while United manager Jose Mourinho side-stepped a question about whether his team were capable of challenging for the title this season.
However, speaking at a press conference following Sunday's 6-1 win over Huddersfield, Guardiola rejected Mourinho's accusation. "We made mistakes we shouldn´t make", said Pogba, whose penalty deep into stoppage time proved too little, too late.
The footage features the Old Trafford derby, won impressively by City in December, and has the narrator, Oscar-winning actor Ben Kingsley commenting: "It is Guardiola versus Mourinho once more".
Manchester United manager Jose Mourinho claims English Premier League rival Manchester City were "disrespectful" and lacking "class" in a behind-the-scenes documentary released this week. It is worrying for Manchester United fans to see their team not perform to their potential.
His relationship with Jose Mourinho is not good right now, despite the Portuguese coach praising his "monster" performance in last week's 2-1 win over Leicester.
Murray conjured a tidy finish to put the hosts ahead, the 34-year-old striker flicking home a finish at the near post.
Defender Shane Duffy doubled Brighton's advantage less than three minutes later, finding space in the box and firing into the bottom corner. He had little impact on the game and his attempts to galvanise his team-mates during a torrid first half in which they conceded three times appeared half-hearted. 3-1, min. 44, Gross. Mourinho turned to two of England's World Cup heroes in Marcus Rashford and Jesse Lingard at the break in search of inspiration.
Manchester United vs Brighton
But the damage had already been done as Brighton sat comfortably on their lead until virtually the last kick of the match. Manchester United fans were definitely disappointed by the weak performance that was put in by the players vs Brighton.
The problem that United had though was that the Seagulls sat much deeper in the second half and that meant the visitors found it extremely hard to break them down.
Bailly and Lindelof both struggled as United looked all at sea on the south coast, with Paul Pogba's injury time penalty putting a brighter look on proceedings.
Man United and Pogba are due to face Tottenham in their next Premier League outing on Monday August 27.
Burnley, who have now gone seven league games without a win, were swept aside by two goals in the opening six minutes of the second half.
Such is City's strength in depth, Guardiola was able to leave Kyle Walker, Riyad Mahrez and Raheem Sterling on the bench.
Former Burnley forward Andre Gray opened the scoring in the third minute with a superbly taken volley.