Question: Why didn't Lotso just press the button to turn off the incinerator? Also can someone explain why he said where is Andy now?
Answer: Lotso did not turn off the incinerator because Woody and the other toys were a threat to his rule at the daycare. Even though he was kicked out by Baby with the other toys gone he could manipulate and gain his leadership back. He says "where is Andy now" as a taunt to the toys. Woody and the others spend the movie trying to get back to Andy but when they are in trouble Andy is not there for them.
Question: Why didn't the toys even talk about coming alive and talking to Andy? Seems they were desperate enough for him to play with them that somebody should have considered this option.
Answer: Because they simply don't do that, it's a fundamental rule of their existence. They're played with as toys, not as sentient moving creatures. Plus there's every possibility that Andy would simply freak out - imagine how you'd feel if all your childhood toys suddenly revealed that they'd been intelligent, with lives of their own, all along. Woody revealing himself to Sid in the first film was a unique case to prevent the deaths of more toys, and Sid was a sufficiently disturbed child that nobody would be surprised if he suddenly freaked. With Andy, it's a normal situation that he's simply grown up and doesn't play with them any more - there's no possible grounds for breaking the rules there.
Question: The trivia for this movie says that a cameo of a toy from Toy Story 2 appears during the credits. I did not notice this cameo. What toy was it, and what happens in the scene?
Answer: I believe it is the cameo of Emperor Zurg, who was last seen playing catch with his "son". This is the only character of significance that I noticed in the credits, though knowing Pixar there may well be more.
Question: In Cars 2, it was decided not to bring back Doc Hudsen out of respect for the late Paul Newman. So why was slinky recast for this film? Didn't the filmmakers feel that Jim Varney deserved the same respect? Considering they didn't bring back certain characters like Bo-peep etc, I find it insulting that they felt so little of Varney.
Answer: Well, with all due respect to Mr. Varney, he's no Paul Newman. You respect different actors in different ways. Paul Newman is much more of a "remember in silence" type actor, when Varney's much more relaxed and silly style lends itself more toward celebrating the character over the actor, in which case removing the character would not necessarily be the best decision. I don't know if these were things the Pixar crew specifically thought of, but that's how I view it.