The opening scene is supposed to continue directly from the final scene of the previous episode, where Langston has just been stabbed by Nate Haskell. However, the positioning of Langston's body, the blood pool underneath him, and the jacket he dropped in the struggle are all completely different in the two scenes.
After the explosions at the funeral, Nick is temporarily deafened from the blasts. Catherine is having to yell to get him to hear her, but then Greg walks up, and talking in a normal voice, Nick is suddenly able to hear him just fine.
When Nick Stokes loosens his tie during the funeral, you can see a black microphone wire in his collar.