When Madame Sandanarik is walking with McGarrett in the cemetery, she has on clear rain shoe covers. When they come around the corner of the tombstones, she is no longer wearing them.
When McGarrett goes to the funeral there is a driving rain. When he returns to his car a few minutes later, all the windows are down.
Although unable to speak, When Kati discovers who Hoffman really is, she whispers his name, then lets out a short scream.
When Hoffman/Zadak shoots himself dead behind the bleachers during the tennis match, the game continues as if nothing has happened. The ball can be heard being hit back and forth, and no spectators look to see what just happened.
The human rights conference is high-security, with all entrances guarded by police officers, yet the assassin simply runs down a passageway and through a storage room to exit into the crowd watching a tennis tournament.