Lionel Messi hit a hat-trick as Barca won 5-4 at the Riazor.
"We could have killed the game off in the first half, but Depor are dangerous and they caused us a lot of problems in defence," Iniesta told the club's official website.
"We're leaving with the sensation that we won a very difficult match. We have to learn a lot of things from this match."
Messi continues to light up the Primera Division and his treble took his tally for 2012 to 59 - beating his previous record of two years ago.
"Statistics are only numbers. I'm only concerned with winning the three points whenever possible," said the Argentinian.