Miguel Ferrer was so devoted to his role, he refused to take time off, even when diagnosed with cancer. When it started to affect his voice, his illness was written into the character as well.
LL Cool J tried to perform his own stunts, where possible. He explained: "I want people to know that I'm invested in the character and I want to give them the real experience".
Here's the boat shed's co-ordinates - "33.974828,-118.446349". Punch them into google maps for a look.
Chris O'Donnell had expressed interest in having Michael Weatherly appear on the show. This finally occurred in Blame It on Rio (2015), although the characters did not acknowledge that they knew each other.
The location of the NCIS LA Headquarters building where they zoom in and out is at the location of the Marina Del Rey Garden Center, 13198 Mindanao Way. Coordinates 33° 59' 00.0" N, 118° 26' 15.0" W. The location of the NCIS Boathouse is at the location of the Loyola Marymount University's Jane Browne Bove Boathouse at 13669 Fiji Way. Coordinates 33° 58' 29.5" N, 118° 26' 47.0 W. The actual appearance of those locations has been digitally altered for the show, but these are the locations. The boathouse is about a mile from headquarters which explains how they get back and forth so quick.