These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Max and Ruby
Designated Monkey: Ruby likes to screw Max over. He's very good at screwing her back.
Memetic Mutation: Max's wide variety of facial expressions come which come across as rather devious for a cartoon character
The Scrappy: Both of the title characters, as Max is either getting into trouble, or Ruby tries to stop him from having fun no matter what he does.
Unfortunate Implications: The unintended moral of the story seems to be "Your younger brother is always right, no matter what." Gets kind of annoying when Max is doing something destructive and manages to 'help' the situation through sheer luck.