Who'd a thought there would be a real "Butt Out"? It's not quite the thing Butt Out! is, though.
Shadows are shown where the boys are smoking. They are on the south side of the school, judging by the shadows.
"Smokin's bad, m'kay?" - When the boys were in third grade, Mr. Mackey gave them similar lectures on marijuana, and drugs in general.
Those flames sure look realistic, aren't they? They crackle too slowly to be real, though.
In this episode, "Ih, it's like the tobacco companies have control of my mind" foretells the adults going after Big Tobacco. In SP:BLU, "That movie has warped my fragile little mind" foretells the parents going after Terrance and Phillip
Three weeks seems to have become the standard grounding period.
Why are the firefighters the size of gnomes? The perspective doesn't change any, but the firefighters look smaller than the students.
Amazing how a tent interior and the Tynacorp interior match perfectly.

It's been a while since anyone has speculated as to what kind of Jew Kyle is. I've said he was a Russian Jew, based on the appearance of his last name. The answer comes tonight: Serbian Jew. Or maybe the Serbian Jew double bluff is something Cartman made up. :)
Cartman's commercial was a spoof of one starring Yul Brynner, who died from lung cancer. The commercial aired after his death and had this line: "I'm Yul Brynner, and I'm dead now ... 'cause I smoked cigarettes."
Back in "Gnomes" in the second season, Mrs. Tweek said the following about swaying public opinion: "We've been using these poor kids to pull at your heartstrings for our cause, and it's wrong. We're as low and despicable as Rob Reiner." So Matt and Trey registered their opinion of Reiner long before this episode, demonstrating now what they said back then: "We're gonna use these children to bring the tobacco companies down!"