Lionel Messi and Xavi recently went public about their outlook on La Liga's referees last weekend, which Callejon finds hypocritical to the morals the club upholds.
"I thought Barca didn't talk about referees," the 24-year-old said to Marca. "Something must have changed. I don't know why."
The winger went on to express his confidence on his team clinching the La Liga title from their arch rivals.
"I don't think they [Barcelona] will be more nervous because we played well last week. I think that Madrid has always been good.
"This club always has the goal of winning every game and winning as many titles as possible."
Callejon also shot down rumours that coach Jose Mourinho could be leaving the Santiago Bernabeu for greener pastures, saying that the Portugese is still eager to hold the reins to lead the club into further successes.
"I see him every day, wanting to work and eager to continue doing important things for Real Madrid. For me and for everyone else, he is the ideal coach with Real Madrid."