The fiery fixture, which finished 0-0, left four Gunners stars suspended.
Patrick Vieira was sent off in the 80th minute after kicking out at Ruud van Nistelrooy, a decision which left Martin Keown furious.
The Dutchman later missed a last-minute penalty, causing Keown, Lauren, Ray Parlour, Ashley Cole and Kolo Toure to confront the striker.
Arsenal were fined £175,000 and warned, while Keown, Lauren, Parlour and Vieira all received bans.
During a Premier League broadcast on Sky Sports, Keane and Henry watched footage of the incidents again and began to squabble over what they saw.
Here’s how their exchange went down:
Keane: “They should be [regretful], to me, I don’t mind lads getting stuck in but that behaviour is disgraceful. I know lads got in trouble, [Ray] Parlour…”
Henry: “Let’s go back to why that happened, let’s all remember, it’s not because Van Nistelrooy missed the penalty. The whole day – and I love Van Nistelrooy – but during the whole game he winded everyone up.”
Keane: “No he didn’t.”
Henry: “Do you remember?
Keane: “I do remember, yes.”
Henry: “He got Patrick sent off.”
Keane: “Patrick got himself sent off.”
Henry: “Remember the whole history. All I’m saying is, that’s why those guys felt that something was going wrong on the day. Not because he missed the penalty, that’s why they went at him, the way he behaved on the day. I called that, it was them sometimes, sometimes it was us.”
Keane: “We never did anything like that [during Arsenal-United games]. United players would never. Arsenal players crossed that line, definitely.”
The Frenchman also spoke about Gary Neville’s actions in United’s 2-0 win over Arsenal the following season. The ex-Red Devils right back appeared to target Jose Antonio Reyes during the fixture.
Henry: “I wasn’t one of them [the aggressors in the 2003 game]! But what I’m trying to say is it was all right then for Gary Neville to kick Jose Reyes? Me, ankle…”
Keane: “But Gary was slowing down at the time, maybe he was genuinely trying to get the ball, maybe.”
Henry: “I don’t agree with that one but I saw it on the day and I thought next time it will be us, next time it will be you.”
Keane: “Why does Martin Keown regret that? Martin has done some daft things on the pitch, so if that’s one that he regrets.”
Henry: “I will be honest with you, I don’t agree with that [with what Keown did], that doesn’t look right.”
United ended Arsenal’s Premier League unbeaten run that day and, again, the game wasn’t without controversy. Alex Ferguson and Wenger clashed in the players’ tunnel and a slice of pizza was thrown at the Scot.
Henry: “Yeah, another thing, when Arsene went at it with Sir Alex in the tunnel and the next thing you know, everyone comes… then I saw a piece of pizza flew over my head and landed on the face of Sir Alex… but I miss those days.
Keane: “It was the one game I missed in about 15 years with illness, which was the Pizzagate. Probably just as well.”