Johnson pointed out the penalty decision given to Marouane Chamakh late in the first half which got the Gunners back into the contest was wrong and also touched on the red card handed to Jack Wilshere for his challenge on Nikola Zigic.
"We all think it (the penalty) was the wrong decision. Chamakh's reaction was an embarrassment," he said.
"These decisions determine people's livelihoods in the league.
"If we go down by a point we will look back to a game like this and think we've been harshly done by.
"From what I saw the Wilshere ¬challenge looked quite bad. Ziggy's a big lad, not the type to go down to milk it. It looked bad. I thought (Emmanuel) Eboue's tackle was awful as well.
"It (Wilshere's challenge) was not too dissimilar to the tackle on Eduardo by Martin Taylor - ankle height, could have snapped his leg. Thankfully it didn't."