Three first-half tries ensured that the hosts had an 18-point lead at the break, but they scored just seven more after the interval.
The England coach told Sky Sports News: "We went in at half time 24-6 and the first half in total was pleasing.
"There were one or two areas we didn't quite get right. Second half, we were a bit loose and it wasn't good enough overall. But I would have taken that scoreline this morning.
"We've got to get that consistency for 80 minutes. Our intent was good and our accuracy was good and that fell away in the second half. Overall there were plenty of positives."
England face New Zealand next weekend.