England ran in three tries in a rampant first half, but stalled somewhat after the break, only adding a fourth try three minutes from time.
Wood was one of six Saints to play in the game - tying a club record - with Dylan Hartley taking home the man of the match champagne and Lee Dickson, Courtney Lawes, Alex Corbisiero and Ben Foden all receiving positive reviews.
But Wood acknowledged that there is plenty to work on ahead of next weekend's game against the world champion All Blacks.
"We took our foot off the gas a little bit," he said. "I don't think it was a conscious thing, we had all the right messages at half-time. But we lacked a bit of cohesion and accuracy. The intent was there, but we didn't have as much direction and didn't apply it in the same way.
"You've got to give a lot of credit to the Argentinians. They came out after half-time, and would have had all the messages about upping their intensity and bringing some pride, and they did that.
"It's a difficult barometer when you play a team like Argentina. On the one hand you want to give them respect. We know how they played in the Rugby Championship, the challenge they possess and the physical power they have.
"The scorelines we had in Argentina were a bit misleading, and it was only because we were on our mettle that we got those results.
"You have to judge each game on its individual merits, and on a different day, a different occasion and a different opposition it will all be different.
"We know we're not going to beat the All Blacks with a 40-minute performance. We'll have to use all of our nous and put all of our energy into that game. But we know that when we're at our best we can compete with these teams."
In other international action George North could not help Wales overcome South Arfica, the Springboks winning 24-15 in Cardiff, while George Pisi started and Kahn Fotuali'i kicked a penalty in Samoa's 9-40 loss to Ireland at the Aviva Stadium.