Give examples of foreshadowing/dramatic irony in the first three chapters.

From the text:

“He wasn’t carrying anywhere near as much food and gear as you’d expect a guy to be carrying for that kind of trip,” Gallien recalls.

Alex’s cheap leather hiking boots were neither waterproof nor well insulated. His rifle was only .22 caliber, a bore too small to rely on if he expected to kill large animals like moose and caribou, which he would have to eat if he hoped to remain very long in the country. He had no ax, no bug dope, no snowshoes, no compass. The only navigational aid in his possession was a tattered state road map he’d scrounged at a gas station.

"Neither of them had been in the bus, but they’d been close enough to notice “a real bad smell from inside.” A makeshift signal flag—a red knitted leg warmer of the sort worn by dancers— was knotted to the end of an alder branch by the vehicle’s rear exit. The door was ajar, and taped to it was a disquieting note. Handwritten in neat block letters on a page torn from a novel by Nikolay Gogol, it read:

S.O.S. I NEED YOUR HELP. I AM INJURED, NEAR DEATH, AND TOO WEAK TO HIKE OUT OF HERE I AM ALL ALONE, THIS IS NO JOKE. IN THE NAME OF GOD, PLEASE REMAIN TO SAVE ME. I AM OUT COLLECTING BERRIES CLOSE BY AND SHALL RETURN THIS EVENING. THANK YOU, CHRIS MCCANDLESS. AUGUST?"