1) He did not try and understand the situation from both points of views before firing up and telling Kushal off. In my view, Kushal was in the wrong and I am glad that Salman told him off for what he did, but I think the delivery could have been slightly better.
Rather than interrupting and using his position as a host to stuff his opinion down the throat, I would have appreciated it even more if they would have shown the clip once again. Usually when a person sees what they said and did, they are more likely to accept they did wrong.
2) He should have reprimanded Tanisha for not admitting her mistake. If Kushal should have apologised (which he really should have), Tanisha should have been told to accept that she pushed him rather than say that she fell.
3) Armaan really should have gotten told off for his anger. The contestants were doing nothing when Armaan started firing up. Salman should have told Armaan to gain a better control of his anger or seek some anger management classes.
4) In my opinion, Salman did not necessarily say anything wrong, but the way he said it was wrong. He did not acknowledge that Kushal had been insulted first. He should have tried to make Kushal understand that being in the box and being targeted in the way Tanisha was - she was bound to come out of the box angry.
All in all, it was a good episode, but I think Salman went slightly wrong in the way he tried to tell off the gang.
It reminded me of the British Big Brother in which the people who were racist towards Shilpa Shetty were severely told off when they came off from the show - but I think in this situation, Salman could have handled it slightly better by giving Kushal and Gauhar an opportunity to talk, and then point out their mistakes.
By the end of the episode though - Kushal did not really make me sympathise with him or anything, rather he came across as being highly egoistical for not even acknowledging that he had done something wrong. Instead asking Salman Khan to open the doors for him...seriously...it just...I think he needs to view Bigg Boss when he comes out of the show to see how he's behaved so far.
This is just my opinion, clearly not gonna go down well with everyone on the forum, however these were a few things I felt after watching the episode.