Ok... yeah, it was a great episode. One of the best of a dullish season.
I shed a few tears for Lionel. I can't believe he's really gone...

I'm glad that Clark realized the truth.
But I think the episode had some weak moments...
Am I the only one who really didn't see the justification, or the motivation behind Lex's murderous act? He got the necklace. His father proposed what should have been an intriguing suggestion. But like Patty Swann's murder, killing Lionel NOW made little SENSE. Of all the times for Lex to be provoked into killing his father... I thought the set up for this was pretty weak.
Jimmy taking that photo was a coincidence that bordered on campy. He and Lois getting in trouble was classic I guess... didn't anyone tell him you should apply pressure to a bleeding wound?! But that whole story-line was made worth while when Clark burst in and warmed them up with his heat vision. Wow!
Chloe's lack of curiosity and concern about that envelope AND it's contents was unlike her. She didn't even think to tell Clark about it right away? And I don't believe that Clark would really have left Chloe ALONE without checking to see if her assailant was gone.
But it was an exciting and emotional episode.
And on that note... I wish I had a nickel for every-time I have said, "can Tom get any hotter?!" Apparently he can! Wow.
