But Forest's pressure eventually told and Ibrahima Sonko's own goal brought the home side level.
Benni McCarthy's penalty, awarded after Ibrahima Sonko fouled Morten Gamst Pedersen, opened the scoring in the ninth minute.
Diao, along with Stoke City team-mates Abdoulaye Faye and Ibrahima Sonko, were caught up in crowd trouble in Dakar.
Referee Peter Walton had a simple decision when Sonko's horribly mistimed tackle felled Pedersen, and McCarthy blasted home the spot-kick.
Rovers released four players at the end of last season, midfielders Edrissa Sonko and Adnan Ahmed and defenders Luke Waterfall and Danny Holmes.
Central defender Ibrahima Sonko, from English second division club Brentford, gets his first call up in the place of Lamine Diatta who is injured.
Leeds substitute Aidan White crossed the ball from the right and Ibrahima Sonko, under pressure in the six-yard box, could only play the ball to Snodgrass, who duly converted.
Firstly, Danny Pugh came on for Andy Wilkinson, then Ibrahima Sonko for Ryan Shawcross and, finally, Ricardo Fuller was replaced by debutant Henri Camara after falling awkwardly and damaging his shoulder.
Hull simply could not live with the blond marksman and he sealed his fourth Liverpool hat-trick two minutes after the break, again found by Benayoun and again coming inside Sonko before firing home.
Fortunately for them Hull were even shakier and before the half-hour mark Torres doubled the lead, slipping on to a Benayoun slide-rule pass, nonchalantly rounding Ibrahima Sonko and Myhill before clipping into the net.
At that stage the score was harsh on Hull, who saw a Sonko header deflected wide and a Geovanni shot fly off target, but from then on it was nothing more than an exercise in damage limitation.
Forest's efforts were rewarded when Sonko's attempted clearance flew into his own net with four minutes to go and then, deep into injury time, Tudgay was on hand to convert McGugan's right-wing cross from two yards out for the winner.
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