The things I look for are the little phrasings or seemingly extraneous bits of info that the Ramseys themselves have offered beyond what was asked. Something that I picked up on that has put a really upsetting notion in my head involves the words "zonked," and "amazed." In their own descriptions of putting JonBenet to bed on Christmas night, Patsy mentions how "she was just really zonked," and John says "I was amazed at how sound asleep she was." This all plays upon the sweet scene of a child asleep in the car being carried off to bed. But in their descriptions I've found that they seem to go a bit beyond and make it seem that she was really- really out of it.
So... is it at all possible that when they put her to sleep- whether straight from the car or after a little snack and playtime, that JonBenet was really- really out of it?
Imagine Christmas night after returning home John helps Burke finish up his model as they both sit on the floor- JonBenet is either helping as well or playing with her own gifts. Patsy has put out a pineapple snack and gone up to do some packing. The model finished or nearly finished the kids plead for more time (you don't just build a toy and then leave it there, you'd want a bit of time to play with the finished piece.) John acquiesces and heads up to get ready for bed. Perhaps from downstairs a noise is heard, but nothing that seems beyond normal sibling squabbling, and either way it ends as quickly as it begins and doesn't warrant an investigation. After maybe ten or fifteen minutes John heads back down to send the kids off to bed. There he finds Burke is still playing, and JonBenet sleeping nearby. He picks up the girl who seems to be in a deep sleep- she's had a long day after all. As he picks her up, he notices she's wet herself, so he carries her up in a bit of an awkward way to keep himself dry (his focus more on that than any other part of her body.) He calls Patsy to JonBenet's room, and they both get her changed while their daughter remains "really zonked." As Patsy finishes up, John makes sure Burke gets into bed as well. John heads up to read, Patsy goes back to packing- neither yet aware of the traumatic head blow their daughter has already suffered.