Arsene Wenger was critical of Blackburn's physical approach as Arsenal booked their place in the FA Cup final with a 3-0 win in Cardiff.
"I'm not angry with the referee but sometimes they tried to stop the game at any cost and it gets frustrating," he told BBC Radio Five Live.
"They tried to stop us from playing but in the second half the ref gave a few more yellow cards and it got better.
"We got a narrow lead and controlled it well but there weren't many chances."
Wenger added: "I was concerned until we got the second goal but high commitment can change it. It is a fantastic day for us.
"We responded to some over-the-edge fouls but kept great focus on the game and never lost our nerve. For a young team that was remarkable."
Robin van Persie scored twice for Arsenal but he was left needing treatment after running into Andy Todd as he wheeled away in celebration after his second goal.
"I don't feel that Andy Todd needed to lift his elbow and he was late to touch him," said Wenger. "He could have stopped himself.
"But was it reckless? I don't know. Only the player, if he's honest, can tell you his intention but you'll have difficulty to prove that he did it on purpose.
"Some people in our dressing room said that it's unclear, a bit what you want to make of it."