The quick and dirty guide to spotting an LSE:
LSEs were only produced in 2002, 2004, and 2005.
All LSEs have the LSE front and rear bumper covers and special rocker panels.
All LSEs have the circular fog lights (as opposed to the D-shaped LS fogs).
All LSEs have all-red taillights.
All LSEs have body-colored grille and license plate surrounds.
All LSEs have chrome bars in the grille.
All LSEs have body-colored skirts (as opposed to gray/black on LSes).
2002 LSEs have quad-tipped exhaust ('04-'05 LSEs have standard exhaust tips).
All LSEs have a deck lid spoiler.
At least for '04 and '05, LSEs had special 7-spoke lightweight chrome wheels.
2006 LSes have all the elements of the LSE package except for the special chrome wheels, all-red taillights, and the deck lid spoiler.
LSEs are only available in certain colors (Vivid Red Metallic, Black, and Silver Birch Metallic, at least in '05).