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.
There's also quite the speculation in regards to Varya. When was she adopted? Who are her parents? Some have speculated that she might be someone else's illegitimate daughter (probably Gaev), whom Raynevskhaya took in as her own child.
Base Breaker: As seen above, people have rather different views of Lopakhin.