#1: Wilkinson brings balance to the back four
Andy Wilkinson made his Millwall debut barely 12 hours after signing for the club.
There wasn't time for him to train with the Lions on Monday, so he went straight to the team hotel on the outskirts of Wigan instead.
The only preparation Wilkinson had for this game was a light walk-through session on an indoor astroturf yesterday morning.
But he slotted in seamlessly at the DW Stadium, bringing much-needed balance to Millwall's back four.
Ian Holloway's defence has been lopsided since Carlos Edwards suffered a horrific knee injury against Nottingham Forest in September.
The Lions looked like a patched-up unit as Alan Dunne, Jimmy Abdou, Justin Hoyte and Richard Chaplow all took turns at filling in there.
In truth there wasn’t an outstanding candidate within the existing group of players to replace Edwards.
Right back had become Holloway's biggest conundrum so it was little surprise that the Millwall boss ultimately looked outside the club for a solution.
On first viewing, Wilkinson seems an ideal addition to the squad – after all, the 30-year-old has made over 100 Premier League appearances in that position.
Against the Latics, he was composed on the ball, forceful in the tackle and always alert to any danger. He did a good job of shackling James McClean.
Wilkinson won't replicate Edwards' attacking qualities but he got forward more often that expected.
One run and cross in the first half was begging for a finish and Holloway made a point afterwards of bemoaning a lack of runners into the box.
This was an impressive first outing for Wilkinson – especially given his lack of match fitness – and he can only improve as he settles into his new surroundings.
#2: Chaplow growing into holding midfield role
Richard Chaplow has shown qualities in recent weeks that Millwall fans – and possibly even his own manager – did not expect of him.
Four times this season – against Reading, Derby, Wolves and now Wigan – Chaplow has been asked to sit in front of the back four as the holding midfielder.
Chaplow has typically played further forward during his career. He was predominantly a right winger at Southampton and a playmaker at Burnley.
But if you look back at the 29-year-old's time at West Brom, you'll see that he does actually have a track record of screening the defence.
And with each game that he plays, Chaplow is growing into the same role with the Lions.
He has always looked neat and tidy on the ball and been a good passer, but of late Chaplow has displayed an added bite in the tackle.
At the DW Stadium, he flew into challenges, won the ball back in the middle of the park and pressed high up the field with energy and purpose.
He made more interceptions (six) and tackles (four) than any other player.
Chaplow brings so much more to the side when he gets stuck in. Long may it continue.
#3: McDonald is a changed man this season
This was a forgettable bore draw but Scott McDonald, to his credit, did his best to inject some excitement into the game.
McDonald has played every minute of every Championship game for Millwall this season and he justified his continued selection with another strong performance.
Linking the Lions' midfield and forward lines, the Australian was at the forefront of their best attacking play.
He was particularly effective at turning out of trouble and getting beyond Wigan's four-man midfield with a drop of the shoulder or a change of pace.
But Holloway's side didn't make enough of McDonald's driving runs into the final third – mainly due to the luck of numbers committed forward.
On two occasions he worked an opening for himself, but his first shot was blocked in front of goal and the second was gobbled up by Scott Carson.
What stood out again, though, was McDonald's general demeanour and attitude.
He dropped deep inside his own half to pick up possession when necessary and charged around the midfield as the Lions pressed the ball.
McDonald is doing a lot of selfless work for the team at the moment and individual rewards will undoubtedly follow.
#4: Gregory starved of the ball down the flanks
Lee Gregory managed just 19 touches of the ball last night as he struggled to influence the game from a wide position.
Gregory was a willing runner and did the necessary tracking back down the flanks but, through no fault of his own, he just wasn’t as effective.
After Saturday's draw with Wolves, Holloway wanted to get Gregory and Ricardo Fuller into the same team – but not at the expense of a 4-3-3 formation.
Millwall started with a midfield diamond and two central strikers against Birmingham in September and were woeful, so you can appreciate Holloway's caution away from home.
But while the Lions were extremely solid and hard to break down, they did miss the threat that Gregory poses when he hangs on the shoulder of the last defender.
#5: Ian Holloway: I’m not a cap person!
Millwall's boss donned a smart flat cap on the touchline to shield his head from the biting wind and swirling rain inside the ground.
But he was the first to admit that it wasn't a good look.
He joked: "I do apologise to everybody because this cap doesn’t really suit this face!"