It was another absorbing weekend in the Premier League, with a changeover of leadership at the top of the table and results of significance at the bottom.
We saw Chelsea knocked off top position following a 3-2 defeat at West Ham, Liverpool replace them thanks to Divock Origi's stoppage time winner at Wolves and then Manchester City take over following an easy win at Watford.
Meanwhile, the Ralf Rangnick era at Manchester United began with a 1-0 win over Crystal Palace, while Tottenham easily brushed aside basement club Norwich.
At the foot of the table, Newcastle finally won for the first time this season as they beat fellow strugglers Burnley.
Here's our weekly assessment of the top-flight action in our Things we Learned column.
Chelsea started Saturday leading the Premier League, Liverpool briefly overtook them but then Manchester City (pictured) assumed top spot after their win at Watford
1. Telles and Dalot step up to give Rangnick a full-back headache
Luke Shaw and Aaron Wan-Bissaka were such regulars for Manchester United under Ole Gunnar Solskjaer their places on the teamsheet were practically set in stone.
England international Shaw enjoyed an excellent campaign last season and though Wan-Bissaka is usually reliable defensively, he has much to learn about the offensive side.
This season, both have struggled for form as Solskjaer crashed and burned out of the manager's job and you wondered whether United had genuine strength in depth in a position so important in the modern game.
Alex Telles impressed as Manchester United began the Ralf Rangnick era with three points
The performances of Alex Telles at left-back and Diogo Dalot on the right in Sunday's win over Crystal Palace suggests there could finally be genuine competition for those places.
That will please incoming interim coach Ralf Rangnick. Shaw is still absent as a precaution after taking a couple of blows to the head in recent games, but Dalot was picked ahead of Wan-Bissaka.
It paid off - Telles touched the ball more than anyone else on the pitch and Dalot showed far more assurance going forward than Wan-Bissaka usually does. Both posed a threat to Palace with high average positions inside the opposition half.
Rangnick will have to decide which full-back pairing best suits his high-octane brand of football.
Rangnick also appeared impressed by Diogo Dalot, who received a rare chance at right-back
2. Lukaku was rushed back… but Chelsea urgently need him to deliver
Thomas Tuchel admitted it was an error to rush Romelu Lukaku back into action so soon after the ankle injury he picked up in October.
But it was a case of needs must during Saturday's 3-2 defeat at West Ham that saw the Blues cede first place in the Premier League.
Kai Havertz also hurt his ankle, just to compound Chelsea's mounting injury woes, and Tuchel wanted more height to defend against West Ham's set-piece threat. But Lukaku was clearly short of full match fitness.
The £97million Belgian hasn't scored for Chelsea since September 14 and though he can hardly be blamed for being hurried back too soon, Tuchel will need him to start delivering goals again soon.
Thomas Tuchel rushed Romelu Lukaku back into action as Chelsea lost 3-2 to West Ham
More often than not, you will need a 20-goal striker to win the title. Lukaku has four overall this season, one more than Timo Werner. Havertz also has four.
Their joint top scorers in all competitions are Reece James and Mason Mount with five apiece. You look at the contributions of Mohamed Salah, Sadio Mane and Diogo Jota, 37 goals combined, and Chelsea don't compare favourably.
There are other ways to win titles but a steady flow of goals from a reliably prolific striker is best. Lukaku needs to get fully fit and get back to his best.
3. Origi among a unique breed who revel in super sub role
'I hope he one day finds a manager who plays him more than me,' was the brilliant line from Jurgen Klopp about Divock Origi after his latest heroics at Wolves on Saturday.
Origi has started only 34 Premier League games in seven seasons at Anfield and, by popular cliche, is entering his prime years at 26. Yet he seems perfectly happy to play the super sub role.
It isn't like the Belgian has anything left to prove. He will always be an Anfield cult hero for his goals against Everton, Barcelona and Tottenham in the 2018-19 season.
Divock Origi scored Liverpool's late winner at Wolves and revels in his super sub role
Yet he remains the ace up Klopp's sleeve and is happy to revel in his bit-part role, issuing periodic reminders of his existence as he did at Molineux.
Origi is clearly good enough to go elsewhere, even down the Premier League table, and contribute 15-20 goals a season. Yet he prefers to warm the bench.
He belongs to a unique and dying band of players who understand the sacrifices required of a back-up striker and is willing to accept it.
Ole Gunnar Solskjaer, Kanu, Jermain Defoe and Olivier Giroud are others. Klopp is fortunate to have someone so understanding but also with a flair for the dramatic intervention.
4. Sterling rises as City hit ominous form
At a time of year when a busy schedule makes it more likely a big team will drop some points, Manchester City are clicking ominously into gear.
They have won seven consecutive matches in all competitions after Saturday's easy 3-1 win at Watford that restored them to the top of the table.
Pep Guardiola said afterwards his side had 'reached their highest standard' of the season to date at Vicarage Road and while Bernardo Silva continued his outstanding form with a brace, their other goalscorer was noteworthy too.
Raheem Sterling headed City on their way after just four minutes, continuing a purple patch in a season that's been far from straightforward.
Raheem Sterling was a blur at times for the Watford defenders in Manchester City's 3-1 win
The England forward has scored against Club Brugge, Everton, Paris Saint-Germain and now Watford in recent weeks and has produced consistently good displays across the board.
Let's not forget that Sterling was struggling to even get a start a couple of months ago with the goals dried up and uncertainty about his future at the club.
It helped his cause that Jack Grealish and Phil Foden returned from the last set of internationals with knocks and Kevin De Bruyne contracted Covid-19 but Sterling has certainly seized his chance.
The goals have helped Sterling's confidence return and we're seen him
