Harvey said Crocker's coaching methods, which involved extensive input from the players, had revived the team.
"He has got a few new ideas. The leaders went to him at each break and gave him a bit of input as well, so I thought that was a real positive," Harvey said at the club’s recovery session on Monday morning at St Kilda Sea Baths.
"After the game he was really upbeat and positive and he just backed our boys; he said we should be pretty proud of ourselves with the way we went about it.
"The Bulldogs are sitting third on the ladder and are meant to be a challenger for the top two, so I was pretty impressed with what I saw yesterday as well.
"As long as we can build on that going forward, we'll be happy."
North Melbourne led late in the third quarter before fading and conceding six of the last seven goals of the match to lose by 22 points. It leaves them in 13th place with just four wins for the season.
But there was a notable increase in the Kangaroos' entries into their forward half during the game, which Harvey credited to Crocker's attacking mindset.
"We've got a team of runners with Gavin Urquhart and Ben Ross, and once Daniel Wells and Matty Campbell and even Lindsay Thomas come back into the team, we'll have even more," he said.
"We'll keep trying to take risks and doing what we did yesterday, which I thought was really good."
Harvey was playing in his first game since round five after overcoming a dislocated elbow.
"It pulled up with absolutely no dramas. It pulled up really, really well, although the rest of the body is a bit sore, as I haven't played for eight weeks," he said.
"I cramped in the last quarter so I've got a little bit more work to do but I'm looking forward to getting out on the track and training with the boys again, and having another good crack against Sydney."
He rued the loss of young forward Ben Warren, who suffered a suspected broken fibula early in the first quarter.
"It's disappointing, especially with him coming back after a broken cheekbone," he said.
"I'm not sure how long it is, whether it's a five-week or the rest of the season injury, but it is disappointing because he's worked so hard from where he was last year to where he is now."
Harvey praised the performance of first-year player Liam Anthony, who finally broke through for senior selection after missing out on a round one debut owing to an injured foot.
"It was long-awaited but fantastic. I think he had 28 possessions and he just found space," he said.
"He's not one of those athletes trying to play football; he's actually a footballer and he can just find the football so it's fantastic for him to get in."
