The largest number of complaints which Ofcom rejected were:
10 June re religious/beliefs discrimination/offence 208 complainants
13 June re generally accepted standards 366 complainants
16 June re generally accepted standards 1,573 complainants
25 June re generally accepted standards 382 complainants
15 August re voting on the Live Final 469 complaintants
Many many other complaints were made but with less than 200 people making complaints against any one programme.
The Ofcom bulletin also says that they have started a formal investigation into the programme on 7 August. That doesn't mean they they will find that a breach of their code has been made but that there is enough concern to justify an investigation.