Dr. Meade's name is spelled with an 'e' on the end in the credits and in his personnel file; it is spelled without an 'e' on his office door.
When Dr. Scranton, Perry and Paul got to the lab, the sign on Dr. Todd Meade's door has his last name misspelled (no "e" at the end).
Horace Lehigh, one of the scientists working for Tryon Laboratories, is actually a private detective working for Dr. Scranton and using an assumed name. He is referred to by this assumed name during the murder trial, even though court actions require that all parties be referred to by their legal names.
No employee would have been allowed into a crime scene. If by some mistake she was signed in, the Lt. Would have seen her on the sigh on log.
Fluoroscope technician is covered to the hilt with rubber gloves, lead chest protection, and eye gear while using the machine to check for bugs while everyone involved is still in the room.