The 2010 Doig Medallist said, after a very quiet plane trip home, the team hoped the bad showing against the Hawks was just an aberration.
"Everyone was cut quite deeply," he said.
"There's going to be an extensive review and we'll learn a lot out of the game.
"Hopefully, most of all, we'll learn not to replicate it."
Senior coach Ross Lyon was scathing in his analysis of Fremantle's midfield, which was comprehensively beaten in Launceston.
Mundy said no fingers could be pointed at individuals and that the blame had to be placed on the group as a collective.
"It's not just about me or Mick (Barlow) or Spider (Aaron Sandilands)," he said.
"There's anywhere up to 14 guys going through the midfield on the weekend.
"It's about the collective and we've got to get better as a group."
Mundy said this Sunday's Carlton Mid Derby against top-of-the-ladder West Coast would be a big test that Freo had to be ready for.
"We've got to get back to playing how we like to play - the pressure in-and-under, extracting the footy - we went away from that last week and paid the price," he said.
"West Coast score heavily from centre bounces and they've got a really good on-ball division.
"Cox and Naitanui have had a great year so far this season and they really set them up and give their midfielders some great service.
"It's going to be a big challenge."
On his own form and fitness, Mundy said he was improving gradually after a delayed start to the season because of injury.
"I'm probably not getting the output that I'd really like or that I know I can, but each week I'm slowly getting better and my GPS data is coming in with fairly good results.
"It's just about the confidence and the consistency."
