When Sgt. Hill's body is brought to autopsy, the endotracheal tube has been removed. It is standard procedure to leave all lines, tubes, catheters, etc. in place after death, especially when an autopsy is expected.
When Bishop is briefing the team on Greg Abell (maintenance man), she says he's 36 years old. However, his driver's license lists his birthday as 03/05/1978, which would make him 38 years old.
When Dr. Grace wants to talk to Gibbs during the interrogation, Bishop stops her by quoting rule 17, never bother Gibbs during interrogation. This is rule 22.