The red shoe is the symbol of femdom events (personally I disabled it, not my thing, I can't help you for those)
If the missing star is in the "Clean" section, it is when you have chores (cleaning the terrace, the pool, the hot tub), when in the "Study" section, it is when Rachel asks you to study.
So, if in the Clean, not aiming perfection means that you need to be distracted by the girls when you do the cleaning. It's mainly Emily and Chloe, on one occasion Linda (pool) and Rachel (terrace). So if you miss a star in cleaning with Emily, try to do cleaning in the specific location mentioned by the hint when she is there. The distraction should be automatic if you miss the star, after that it is random.
The developer does watch this thread and takes into account the frequency and topics of the questions to improve the hints, when need be. It has already changed a lot since the earlier versions, believe me.
As for helping, thanks, my pleasure. I'm only trying to give back on this thread the help that I receive on other threads for other games