It was a mistake which would have had Manchester United supporters wincing. And not just because the beneficiaries of that blunder were none other than Man City, their sky blue-clad neighbours moving one big step closer to yet another Premier League title. But because one of the men tipped to replace Erik ten Hag in the Old Trafford dugout had just seen his team embarrassed by the sort of error that will have had the likes of Sam Allardyce chuckling and shaking his head at those wedded to their ‘tippy tappy’ style. Remember that scene in Raiders of the Lost Ark when that guy is showing off in …