Yeah, the whole "lawn gnomes" thing was some really weird and completely off-beat joke about her being kidnapped in LP1, where she was taken to the Evil Tower. She is not kidnapped in LP3, though.
As for "King Sun Concentrate", I'm really not sure! It says "ask your sun masters", but I haven't found any "sun master" anywhere in the game, so I think it's just yet another one of those irrelevant teasers.