Are there any examples of logos appearing in Into The Wild?
The way that I interpret this question is that it is asking if any company logos appear in the book. I can provide two specific times when Krakauer comments on a specific logo within Into the Wild.
The first described logo is the logo found on Chris McCandless when he was discovered dead in the bus. When McCandless was found, the Alaska State Troopers could not identify who he was. McCandless didn't travel with any kind of identification. McCandless happened to be wearing a shirt that had the logo of a towing company in Santa Barbara. The law enforcement officers then contacted the towing company in hopes that they knew McCandless.
The second specific logo mentioned in the book appears on a jacket being worn by Walt McCandless. The jacket's logo is for the Jet Propulsion Laboratory.
If by "logos," you mean logic, then the best example from the book would be chapters 8 and 9. In those chapters, Krakauer tries to convince readers that McCandless is not some singular crazy guy. Chapter 8 focuses on Gene Rossellini, John Waterman, and Carl McGunn, and chapter 9 focuses on Everett Ruess. During these chapters, Krakauer attempts to establish similarities between McCandless and the four men. The arguments are presented in a logical format with supporting evidence, and those chapters did quite a bit to change my opinion of McCandless himself.
The author uses several examples of logos, or an appeal to logic, to show how woefully unprepared Chris McCandless was for his trek into the interior of Alaska. For example, the author cites Jim Gallien, an experienced woodsman and hunter, who reports that McCandless was carrying far less food and gear than what was needed for the kind of trip he was going on (page 4). This is also an appeal to ethos, or credibility, because Gallien is an outdoors expert. On the next page, the author includes more logical details to show that McCandless was headed for disaster and to illustrate the cause of McCandless's demise. The author writes that the only food McCandless had in his pack was a ten-pound bag of rice, and he also writes that McCandless's cheap hiking boots were not insulated or waterproof.
The author uses a series of logical facts to show that McCandless's preparations for his trip into the bush were almost farcically inadequate. For example, Krakauer writes on page 45 that McCandless was doing calisthenics each morning to get ready for his trip (hardly the right preparation for his trip). This compilation of logical facts shows that McCandless was not prepared for his journey into the wild and that he was very naive about the conditions in Alaska.