James Dornelly opened the scoring for Posh, but the visitors were 3-1 up at half-time thanks to goals from Sam Nombe, Mallik Wilks and Jonson Clarke-Harris.
Joe Rafferty's own goal and Emmanuel Fernandez's header earned Darren Ferguson's side a point.
"Is Nombe's a penalty? It looks a penalty to me," said Evans.
"He chops a boy and he takes his standing leg, but I'm not allowed to appeal and raise my hands for it.
"We did enough to win the game.
Cohen (Bramall) should score and Esapa (Osong) should do better there at the end. It's two points dropped. If it's based on clearcut chances we should win the game at the end, and we should win the game at 3-1 up.
"We didn't think it would be an own goal to get them back in the game, but that gets them up.
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