These videos show the largest Margins of Victory in World Cup History. The first three are from the 1982, 1974, and 1954 World Cup Finals and have a record 9 goal margin of victory. The fourth video shows the somewhat ridiculous 31-0 Australia-American Samoa blowout from a WC qualifier in 2001. The last two videos are the biggest margins from the last two World Cups, with a 6 goal win by Argentina in 2006 and an 8 goal victory by Germany in 2002.
Hungary (10) vs El Salvador (1) - 1982 World Cup
Yugoslavia (9) vs Zaire (0) - 1974 World Cup
Hungary (9) vs Korea Republic (0) - 1954 World Cup*
Australia (31) vs American Samoa (0) - 2001 WC Qualifying Match
Argentina (6) vs Serbia and Montenegro (0) - 2006 World Cup
Germany (8) vs Saudi Arabia (0) - 2002 World Cup
*The video technically shows footage from the Turkey-Korea Republic game from 1954, but it's the only video I could find with a mention of the Hungary-Korea Republic game