Dead Reckoning : 6.20. Name Mix-up.
At the beginning when McGee is searching for Gibbs by searching for his cellphone GPS, the computer shows 'J. Leroy Gibbs' as a label for the cellphone. It should be 'L. Jethro Gibbs' as his proper name is Leroy Jethro Gibbs, not Jethro Leroy Gibbs.

Road kill : 6.10. shoes.
At the crime scene there is a foot print, and Tony tells Gibbs that it is not the victims because the victim was wearing Converse All Star shoes, and says that they were basketball shoes. In an earlier episode it shows Gibbs wearing Converse so he should have known the shoe.