Eddie Jones had urged England to "smash" Japan and he thinks those comments were ringing in the Brave Blossoms' ears at Twickenham.
Teenage lock Joel Kpoku came off the bench to give Saracens a seventh Premiership wins out of seven, which put them back at the summit.
Italy were hard done by in Padova on Saturday when Tito Tebaldi's first-half try was ruled out, according to Conor O'Shea.
Japan led 15-10 at half-time, but England scored three tries after the interval to avoid a huge upset at Twickenham.
Tonga showed some fight but Wales ultimately stormed to a 74-24 victory at the Principality Stadium.
Australia warmed up for their trip to Twickenham with a 26-7 victory over Italy, with Marika Koroibete scoring twice for the Wallabies.
Gloucester had Danny Cipriani back from a ban and the fly-half was instrumental in their bonus-point 36-13 win over Leicester Tigers.
Kieran Marmion thinks Auckland-born Ireland international Bundee Aki "won't hold back" when he faces New Zealand on Saturday.
Having joined the RFU in 2011 and been chief executive since September 2017, Steve Brown has announced he will leave at the end of the year.
Josh van der Flier will start as flanker against New Zealand after Ireland confirmed Dan Leavy would miss out through injury.