2. Hookers to run amok
Two of the smallest men on the park will be hugely influential to either side's attacking plans, with Kiwis hooker Issac Luke and Samoan No9 Pita Godinet two of the best dummy-half runners in the game.
Godinet was dynamic for his side against England last weekend, scoring two vital tries and constantly threatening with his darting runs, while the Kiwis will be looking for the same from Luke, who makes his return to the playing field after missing the Rabbitohs' grand final win and last Saturday's victory over the Kangaroos.
Thomas Leuluai was terrific for the Kiwis against Australia, defending strongly and marshaling the troops, but Luke's attacking flair adds another dimension to their attack.
3. Backline battle will be evenly matched
Although much of the build-up has centered on the expected forward battle, with both sides boasting huge forward packs, the contest between the two backlines could prove just as pivotal.
The Kiwis have the stronger halves pairing in Shaun Johnson and Kieran Foran, but midfielders, Dean Whare and Shaun Kenny-Dowall are in for a stern inspection against Samoa's in-form pairing of Joey Leilua and Tim Lafai.
Veteran Kiwis winger Manu Vatuvei, in his first appearance for the tournament, will be tested in defence by Samoa's Daniel Vidot, and will be targeted under the high-ball. He will need strong support from the likes of fullback Peta Hiku and Jason Nightingale.