Steve Thomas said the "smear" was a water mark.
I don't give too much thought to the packing peanut, either - not only was it Christmastime and those things in abundance when shipping packages, but they have an extraordinary amount of static cling. The packing peanuts could have come from inside the house and ended up in the window well and in the cellar room by any number of ways. I don't see them as clear proof that an intruder killed JonBenet and used that tiny window as an entry/exit.
Mainly because of the spider web and lack of evidence on the window and sill. It was 10 degrees at 6 am, as noted by Sergeant Reichenbach as he passed the mall on the way to respond to the call for help at the Ramsey house. There's no way that spider came out and repaired the web, and with it spanning the grate, there's no way anyone went in or out that window - especially not without leaving any forensic evidence of having gone through it. That video of Smit coming in it proves it's a tight fit, and that there would have been much more debris and disturbance than what was seen. It should also be noted that some of the photos Smit uses to back up his theory were taken much later than the 26th.
I still want to know - where the heck was Smit when Karr was caught, and all the IDIs (including Boulder officials) rallied round to slap each other on the back? he should have been right there, showing us how he was right, and the intruder went in through the window and got JonBenet up for a pineapple snack before stun gunning her...oh, that's right, that wasn't part of Karr's bogus confession.
There's a lot about Smit's intruder theory that falls apart when scrutinized...such as a complete lack of any forensic evidence that anyone other than a Ramsey was in that house that night. I think he should continue being as silent and as absent as he was during the Karr disaster. Any cop who decides to believe a parent couldn't have killed their child because they swore to God they didn't and then prayed with him needs to spend more time studying crime and the way people involved in crime, even people who have never been involved in crime before, might behave.