The rules say that if you put another player in danger,it does not have to be deliberate,both Manes and Ritchies could have been reds.Ritchie received a yellow so no retrospective action will be taken.
Merino will not be done for diving as no advantage was gained.If we had got a penalty and video evidence later showed it to be simulation then he would have got a two match ban.
Diame could have got a red for his tackle if the ref had seen it.