Tony says, " Once is a tragedy, twice is coincidence, third time is a pattern." It's a reference to "Goldfinger".
The deceased had traces of "turpentine, acetone, and benzene" in his body. Those are the same ingredients in "the dip" in Who Framed Roger Rabbit (1988).
It is the second time that finishes with highlighting the teeth of one of the team members. The first one is in Escaped (2006), where McGee shows his bright white teeth when Gibbs returns.