Sigh. Those Supermanly poses just make me wonder even more, why he isn't the movie Superman. THAT's what's truly Unbelievable.
I'm still thinking on the preferred references to Smallville idea, but so far I'm pretty much in agreement with what AgentPat said. Unobtrusive references that would be blatant glaring things to Smallville fans, but that someone who hasn't seen Smallville wouldn't necessarily notice...Sort of similar to John Landis' "see you next Wednesday" line that comes up in most of his films...
Maybe Lois could even "inherit" the wall of wierd and comment on it offhandedly, ie:
Jimmy or Perry (to Lois, while looking at Lois' office wall): "What IS that MESS?"
Lois: "Oh that. I sort of 'inherited' it from my cousin. She was into those off-the-wall stories. I find it inspirational."
Something like that...
From what I've observed in other threads, "they" seem to be fishing to see if people would like a cameo from TW. While I wouldn't like to 'rob' TW of a cameo if that's all he felt up to schedule-wise, it is a touchy thing because it will be a glaring example of 'what could have been'. Thousands of fans have seen or hoped for, or argued for TW in the title role. He's inspired very passionate discussions regarding casting, (for or against, people are still talking about him in relation to the title role). I'm thinking putting him on the screen for a brief moment would really make people wonder what the heck went on that meant he's not the one in the tights--especially if he comes across better than Brandon in look, acting or charisma, or all three...
Hey, maybe that would be something....put them both on the screen at the same time and let people compare to their hearts' content. j/k... (I think Brandon has enough to contend with, already). Lol.
Better yet, let TW have a really LONG cameo...

like an hour worth of lines, and get him that blue suit from wardrobe... Lol. That would appease a lot of fans. (Sure, it would irk *some* fans, but there'd still be more people talking about the movie, or at least caring more about how it all goes down.)