Manuel Pellegrini was happy to see Manchester City move joint top of the table, but Neil Warnock was in a much darker mood following Crystal Palace's 3-0 defeat at the Etihad Stadium.
City moved level on points with Barclays Premier League leaders Chelsea thanks to a brace from David Silva and Yaya Toure's fourth goal in six matches.
But Warnock thought his team could have taken something from the game had they not had a goal wrongly chalked off while the hosts were 2-0 up.
James McArthur's effort was disallowed halfway through the second period even though he was played onside by City midfielder Fernandinho.
"It was a disgraceful decision," the Palace boss said. "The linesman was in a terrible position. I don't understand why top-class officials get it wrong like that.
"There is no explanation for it. The linesman will be disappointed when he sees a replay, but that's no consolation to me. It was a game-changing decision."
Third-placed Manchester United are seven points behind Chelsea and City following their 1-1 draw at 10-man Aston Villa, which ended the Red Devils' six-game winning streak.
The hosts led against the run of play through Christian Benteke's fine, curling finish in the 18th minute, but a Radamel Falcao header drew things level in the 53rd before Villa's Gabriel Agbonlahor was controversially sent off following a challenge on Ashley Young.
West Ham remain fourth and are just a point behind United after beating rock-bottom Leicester 2-0 at Upton Park.
Andy Carroll pounced on a Paul Konchesky error to put the home side in front in the first half and the seal was put on the Foxes' 10th defeat in a 12-game winless sequence when Stewart Downing fired in after the interval.
Southampton emphatically brought an end to their run of five straight losses in all competitions by seeing off Everton 3-0 at St Mary's.
A Romelu Lukaku own goal and efforts from Graziano Pelle - his 11th goal of the season - and Maya Yoshida sealed the points for the fifth-placed Saints, who are two points behind West Ham.
Tottenham are up to sixth, with goals from Harry Kane - now on 14 goals for Spurs this term - and Erik Lamela either side of Ashley Barnes' reply guiding them to a 2-1 home win over Burnley.
At the other end of the table, QPR moved out of the relegation zone as Charlie Austin's hat-trick saw them complete a remarkable comeback from 2-0 down to defeat West Brom 3-2 at Loftus Road.
Albion raced into a two-goal lead through early efforts from Joleon Lescott and Silvestre Varela, but Austin swiftly hit back with a penalty before adding a leveller and then 86th-minute winner.
It takes his goal tally for the season to 11, while his team have moved up from 18th to 15th, two points clear of the drop zone.
Burnley have replaced QPR in the bottom three, slipping to 18th place, while Hull stay 19th after they lost 1-0 at home against Swansea. Ki Sung-yeung's early strike proved the difference as the Tigers' run without a win extended to 10 games.
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