I was struck by this also. First, they separated European rulers from the rest of the world, putting Europeans up front. Even with that division, I would have expected them to follow precedence, but they didn't.
Queen Margrethe was in the right place, as was Sweden, but Norway should have been to their right.
I think what messed them up was the uneven number of people from each country. With three from from Netherlands, and four from Spain, the correct order would have meant breaking up delegations between the rows. IF they had stuck to 2 per country it would have worked perfectly:
R1: Denmark, Sweden, Norway
R2: Netherlands, Belgium, Spain
R3: Luxembourg, Liechtenstein, Monaco
R4: Greece, Romania, Serbia
Another option would have been 8-seat rows, which would have required shorter rows for the former household members in the next section.
Oh well, they worked with they had, I guess.
I am trying to figure out what order it was done in...maybe longestvreigning European royals ( from the right)? I was surprised to see the Emperor of Japan so far back TBH.
For those interested in the seating arrangement at the funeral and who sat where.
1. Princess Beatrix of the Netherlands 2. Queen Maxima of the Netherlands 3. King Willem-Alexander 4. Queen Silvia of Sweden 5. King Carl Gustaf of Sweden 6. Crown Prince Frederick of Denmark 7. Queen Margrethe II of Denmark 8. King Harald of Norway 9. Queen Sonja of Norway 10. Queen Sofía of Spain 11. King Juan Carlos of Spain 12. Queen Letizia of Spain 13. King Felipe of Spain 14. Simeon of Bulgaria 15. Princess Charlene of Monaco 16. Prince Albert of Monaco 17. Grand Duchess Maria Teresa of Luxembourg 18. Grand Duke Henri of Luxembourg 19. Queen Mathilde of Belgium 20. King Philippe of Belgium 21. Prince Radu of Romania 22. Margareta of Romania 23. Marie-Chantal, Crown Princess of Greece 24. Crown Prince Pavlos of Greece 25. Hereditary Princess Sophie of Liechtenstein 26. Hereditary Prince Alois