The most obvious 'plot hole'
First I would like to say that I couldn't care less that this is a plot hole, it's a kids movie so no one should but I just find it hilariously obvious and wish they would have tried to explain it.
So in Sid's backyard we learn that toys have the power to reveal themselves at any point even if it is breaking "some rules" as Woody points out, So with that revelation it completely undermines the entire plot of the film.
The film centers around Buzz's denial (and Woody's jealousy) that he is a toy and no matter what is said to him he will not believe different so why would Buzz act like a toy around Andy or any other human until he was convinced he was a toy? Aa I said I don't really care but come on, this is a little too obvious. Thry could have at least thrown out some excuse like toys can only come alive in front of people if the situation is dire. Oh well, still a 10/10 film.
There are a couple more but this is the most glaring.