Plot hole: There is no possible way for the chubby mayor to be able to get in Flint's lab. There is no side entry, and the space other characters use to get in is too tight for him.
Plot hole: When Flint gets to his lab to shut down the machine he finds the mayor there inputting more food. The mayor says he's been ordering food for ten minutes, how is this possible when he was just there with Flint on the stage barely a minute or so before? Also, how did the mayor manage to get his large self back to Flint's lab so quickly?
Suggested correction: This isn't really what happens, although it looks like it does. The mayor's thumbs are not pointing outwards, they are curled around the fence wire. As he continues to grab the fence, his thumbs don't clip through it, they curl more and more around it, getting a tighter grip on it. Then when Brent says, "But not me, right?", he lets go, and you can see his thumbs curl back out. This is all visible if you look close enough.
zenee