Ireland now sit first in Pool A, but will drop to second if Japan take two points from Sunday's weather-threatened game against Scotland.
Bundee Aki was red carded in the first half after a high tackle.
The Irish were already leading 21-5 by that stage but still managed to seal a bonus point try just before half-time and finished the game with 26 unanswered points, setting up a blockbuster quarter final clash against either New Zealand or South Africa.
The final pool game is Japan v Scotland at International Stadium Yokohama on Sunday evening, Typhoon Hagibis permitting.
Although he defended his player for his high shot that forced out-half Ulupano Seutini off with a head injury, the Ireland head coach said the red card will make it hard for Aki to avoid further censure.
The Six Nations side gained a man advantage when Australian referee Nic Berry sent Samoa hooker Seilala Lam to the sin bin for a unsafe tackle on Jacob Stockdale.
Joey Carberry replaced Sexton but the scoring rate didn't drop as Ireland produced their best performance of the tournament with the pressure on.
"Ultimately there was no panic, there was a lot of collective and we continued to attack them".
"Another 20 minutes here in that game with only 14 men but they spent just about the whole game with only 14 men", he said.
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Johnny Sexton scored two tries and finished with 18 points.
TJ Ioane was one of two Samoan players to be yellow carded. "We will undertake detailed venue inspections as soon as practically possible after the Typhoon has passed, and an update will be published as soon as that process has been undertaken in the morning", World Rugby said in a statement Saturday.
"With a man down, that's the strong suit you're going to play".
Bundee Aki leaves the field after being sent off against Samoa. But we gave away way too many penalties.
Speaking after the game, Jackson maintained that there was no malice in Aki's hit and shared his hope that he will play some part in the remainder of Ireland's tournament.
"If you look at Bundee's tackle again.I think he only had about two or three meters to make a decision on what sort of tackle type to make", Jackson said.
Ireland coach Joe Schmidt said the dismissal was "devastating" for Aki, who faces missing the rest of the tournament.
"So we live in hope and we will see what the judiciary decide but once it's a red card you sense a loss of control over what happens next, no matter what you try to present we knows there's a very hard line".