I didn't even know there was a difference. Looks like the only major change is that the LE got All-Mode 4WD.
Quoted from another user on the evil nissanforums forum... not sure of the reliability of this info but I can't find much online.
Last year I replaced my 2001 LE with an 2001.5 LE. Many people do not even know that there was an 01.5 model so I wanted to post the differenced before I forgot them. 01.5s started with VIN 550,000. If anything is wrong or missing please let me know.
01.5 added:
All Mode for LE (01s were manual 4x4 only)
Available NAV system
Available entertainment system
Pre-wired for entertainment system
Scissor jack rather than bottle jack
3 child seat tether anchors added to hatch floor (01 has threaded bolt holes)
Fixed 1-2 transmission flare on cold days (01 has a TSB to fix)
Pwr button added/ down removed from steering wheel radio controls (may be because I have NAV)
New factory service manual