Hi there!
Well, HIEW is not a FULL Disassembler, so I suppose that's why the refs are missing, never used it! The Serious Sam 2 exe either has Anti-Disassembler tricks or something screwed in the header to fool W32Dasm, dunno, I'm not an asm programmer
The guys over at the RCE are THE GUYS to ask such questions, they know their stuff!!
DrA.