I think that their first goal was a push on Isaac Osbourne and their penalty was very soft indeed," said Coleman to the club website.
"Our penalty was also soft so I think that the referee tried to level things up.
"I am a great believer that things even themselves up over the course of a season but it doesn't make that result any easier to take for us.
"We have to get things right away from home but the performance tonight was certainly worlds away from the second half against Scunthorpe.
"Paddy Kenny made some excellent saves and that says a lot about the game.
"Sheffield Wednesday will come to the Ricoh Arena on Saturday with confidence after their win tonight but we have to be ready for them."