Here's another plot hole. In the NCIS series, Gibbs said he slept downstairs on the sofa because he couldn't sleep upstairs in the bedroom that he and Shannon shared. He also stated the all 3 Gibbs, Kelly and Shannon lived in that house in DC. HOWEVER, in NCIS Origins, it stated the Kelly and Shannon were killed while Gibbs was stationed at Camp Pendelton in California, and they shared that house in CA. So how could they have lived in DC in Gibbs house together, if they were killed while he was stationed in Cali?

That's a big discrepancy