I can't find any info on Lostpedia about Hidden Mickeys in the show. ABC is Disney and Disney LOVES to hide the iconic 3 circle "Mickey Head" symbol in everything they create, and apparently that includes LOST.
I found one in s2e6 shown below (in the brown bowl at the bottom of the frame). Would it be appropriate to make a new page for Hidden Mickey sightings? I refuse to believe that in a show with this much attention to detail that this wasn't an intentional placement. I want to know if others have seen them too!