The Irish dominated the first part of the match and with three tries led the Pumas by 13 points at the break, but just as against the All Blacks last Friday, ill discipline and shoddy play allowed their opponents to take the initiative.
"It was three or four games in one, wasn't it really?" said the 49-year-old Farrell.
"Obviously the over-riding feeling is we're delighted to get the win. We said last week we had a chance of winning ugly. We did that this week, that's a plus."
Farrell said in a post-match TV interview some of Ireland's discipline had been "desperate" - they conceded 13 penalties -but he was more measured at the press conference.
"It's something that we've been outstanding on over the last 10 years actually," he said.
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Tourism after US terror
New Orleans is a city of tremendous spirit - Biden
Fatal mistakes in route-planning
You're going nowhere quickly in Cape Town
Shiraz's visual tapestry
Alley art reminiscent of Surrealism
Zuko maintains his positive vibes
Mamelodi Sundowns defender Zuko Mdunyelwa is optimistic about winning his place back in the team after overcoming a groin injury.
A giant nail-biter
SA20: DURBAN FRANCHISE GRABS VICTORY FROM THE JAWS OF DEFEAT
Cheetahs have no room to slip
The Cheetahs are under no illusions that a loss against Italian side Zebre could spell the end of their race for the Challenge Cup title.
Mpeku handed his Lions debut
BIG TEST: VD MERWE ALSO BACK TO FACE MONTPELLIER
Aldcroft named to lead Red Roses
Zoe Aldcroft is set to lead England at this year's Women's Rugby World Cup on home soil after being named as the team's captain for 2025.
Bulls are not chucking game
While Bulls director of rugby Jake White (above) said they are not kidding themselves about their position and prospects in the Champions Cup, from a coach's perspective he owes it to his players to follow the strategy he set out at the start of the season and rotate his squad regularly.
Stormers treating every Cup match 'like a play-off'
The Stormers are banking on the return of several stalwarts to beef up their team for their must-win Champions Cup game against English side Sale Sharks at Cape Town Stadium today (kick-off 3pm).