"You can't keep a lid on everything," Gatland said. "You play a night game and there's a lot of adrenalin so you say to players, 'Go out, but get back into the hotel by 1.30am.'
"A lot has been made that we're whiter than white - we're definitely not."
In Wellington during the lead-up to their quarter-final, Gatland made reference to his players being great ambassadors, which was seen as a none-too-subtle dig at England, whose off-field indiscipline endeared them to nobody, including team sponsors.
"As a coach I don't take any pleasure of the criticism that's been heaped on England," he said. "I know what it's like to be on the wrong side of the media in the past, so as a fellow coach, there's a lot of good friends of mine in the England set-up, I don't take any pleasure in all that criticism.
"But these guys have been great ambassadors for Wales in this campaign."
Gatland also moved quickly to quell any potential controversy around the All Blacks drafting Matt Todd into training.
"I spoke to Liam Messam when I was in Hamilton and he'd been training with the All Blacks as well," Gatland said.
"We're bringing in six players to train against us today. Sometimes when you're carrying injuries it's good to bring in some fresh faces.
"I don't have an issue with Matt Todd training at all with the All Blacks. There has to be some sort of perks to playing the World Cup in your own country.
"It's not an issue. If Richie does break down, they're just covering their bases."