Hibs remain rooted in the bottom six after suffering five defeats in eight games since Calderwood took over from the sacked John Hughes, and the former Nottingham Forest manager is keen to make his team more resilient.
"It looks quite easy to score against us and that's something we've got to look at," Calderwood said.
"It's not as if we're stretched, we've got enough bodies back. It's then the responsibility of those in the areas of the pitch.
"Both goals came from round about the same area and I think it's the same player.
"They are not soft goals because they are good goals from their aspect, but it just looked a wee bit too tame."