Yay Visha!!! You got it. The plate was a huge controversy because it was part of the argument that Paul MacCartney was dead. "LMW" was taken to mean "Linda MacCartney widow", and "28IF" was interpreted as meaning "[age] 28 if". That is, Paul would not get to his 28th birthday because he was already dead. Another "clue" was that in the famous photo, Paul is barefooted.
Yes, America was as crazy about such things then as it is now!
Nobody living can ever stop me
As I go walking my freedom highway.
Nobody living can make me turn back:
This land was made for you and me. (Woody Guthrie)