Riley asks her father to scratch her nose because the paint on her arms and hands won't be dry for a certain amount of time, yet she puts her arms and hands down on the desk and there is no paint smeared on it. (Also to note, most of the paint on her was clearly dry.)
Riley's purple cat painting at the beginning was clearly not done via finger painting.
Chairperson Sanchez is supposed to be an art major from Princeton but she can't even pronounce, one of the most famous paintings in the world, Guernica properly.
Maya is supposed to be an art fanatic but completely mispronounces Guernica. Something that most people wouldn't do, let alone a fan of Picasso.