I figured something must be up when Lois asked whether or not Clark had read the invite. He should have known Lois was trying to warn him.
I knew I had heard Will Truman's name somewhere before. I got a little confused by the mention of Jack, because of course, I was think of S1 LnC Jack and then I realized who it was when I saw Grace's name.
Clark walked into that one, didn't he?
What a fun crossover.