I have three:
1. ANYONE fired over Omarosa.
2. Kim Kardashian fired because she had a DUI. I'm by NO MEANS a fan of the Kardashians and think people should be punished more if the get behind the wheel drunk (as I've nearly been hit and would've been killed by one without excellent peripherial vision); however, DUI's are public record therefore Trump KNEW she had one and therefore if he knew and was against her having one she shouldn't have been cast. This screams as bit casting on his part to draw in ratings and drama.
3. Annie over Joan. Flatly, Joan quit, Annie DOMINATED the fundraising (at the time the biggest weight in the final challenge) and had a far superior presentation. Joan could ONLY resort to the name calling and attacking Annie for what she supposedly did to her daughter and the like. Trump actually did what he hates (rewarding laziness) fired the person who actually worked for her earnings and her keep and I think even won the bonus on top of it over the one who whined and cried and blamed her issues on another person. Though at least here Annie STILL I think outraised Joan in the end even with the grand prize.