Leicester pulled away in the second half but only secured their bonus point when replacement prop Rob O'Donnell was sin-binned in the last minute and Crane powered over.
After half-time, Mafi was sin-binned after a high tackle on Rob Kearney but O'Gara kicked the 14 men back in front after Gordon D'Arcy had transgressed at a ruck.
Brian O'Driscoll and Rob Kearney produced superb breaks but poor handling prevented any Leinster tries.
Alan Carr, Piers Morgan, Paul O'Grady, Rob Brydon and Alan Titchmarsh are also up for the prize.
Captain Brian O'Driscoll, Rob Kearney and Shane Horgan also crossed as Ireland built on a 13-3 halftime lead.
Sean O'Brien, Rob Kearney and Gethin Jenkins have also been added to the injured list ahead of the weekend.
Sean O'Brien and Rob Kearney ran in first-half tries as Leinster led 21-6.
Leinster, who rested Brian O'Driscoll, Rob Kearney and Felipe Contepomi amongst others, remain second in the table while Edinburgh move up to third.
They finally extended their lead when Nacewa finished off a fine move involving D'Arcy, O'Driscoll and Rob Kearney four minutes after the break to claim his first Heineken Cup try.
Seven players drop out from the 34-man squad announced for the short training spin in September, with Tommy Bowe injured and Peter Bracken, Tom Court, John Fogarty, Alan Quinlan, Mick O'Driscoll and Rob Kearney not required.
BBC: SPORT | Rugby Union | Irish | Flanker Ferris in Ireland call-up
The quartet of Leinster players - O'Driscoll, Rob Kearney, Luke Fitzgerald and Jamie Heaslip - plus Leicester's Tom Croft and Harry Ellis and Northampton prop Euan Murray were rested for the opening match after their exertions last weekend.
Brian O'Driscoll, Earls, Rob Kearney and Shane Horgan added further touchdowns after the interval.
Despite going 10-0 behind courtesy of a Rob Kearney try and two successful kicks from Ronan O'Gara, the home side hit back for an important victory.
Barry Bloom, Jim Caple, Chris De Luca, Gordon Edes, Jeff Fletcher, Gerry Fraley, Paul Hagen, Tom Haudricourt, Mike Imrem, Bruce Jenkins, Richard Justice, Tim Kawakami, Tom Keegan, Tim Kurkjian, Carrie Muskat, Bob Nightengale, Ian O'Connor, Buster Olney, Rob Parker, Joe Posnanski, Ron Rapoport, Tracy Ringolsby, Henry Schulman, Claire Smith, Jayson Stark, Dave Van Dyck.
Shaun Berne and Niall O'Connor exchanged penalties before Gordon D'Arcy fed Rob Kearney who raced clear to score a try under the posts.
Tries from Jamie Heaslip and Tomas O'Leary put Ireland 23-3 up but Italy responded when Kaine Robertson charged down Rob Kearney's kick to score.
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