> Given the 1973 logo ( http://www.logodesignlove.com/images/evolution/lego-logo-12.... ), in 1998 the image was tightened to make it easier to print digitally ( http://www.logodesignlove.com/images/evolution/lego-logo-13.... )

As far as the changes go... look at the removal of white space in the area between the 'L' and 'E' and within the 'O'. Furthermore, the middle bar of the E was made more pronounced, and the upper terminal of the 'G' was made more regular.