Rovers took a late first half lead through Jason Roberts but within two minutes the visitors levelled through Richard Garcia.
Blackburn boss Paul Ince blamed the midweek internationals which claimed ten of his squad.
"It was very very hard, I knew it would be," said the Rovers boss on Radio Rovers. "Being a player myself, going away on international duty and then coming back is always difficult. I've had about an hour with all my players this week.
"And at times it showed, we looked tired, very lethargic. I think conceding the goal so soon after we had just scored killed us a bit. It was very disappointing defending.
"Phil Brown (Hull boss) has had all but two people all week, whereas we've had ten players away and it showed at times. Obviously the expectation because you are playing Hull at home, a team that has just come up, can be mentally draining.
"I'm not pleased with the performance, but I can understand why we played that way, it will be nice to have a full week with my team.
"But at the end of the day if someone had said to me Everton away and Hull at home, you'd take a draw at Everton and a win against Hull. It is still two unbeaten and that is the most important thing."