When Detective Zach Nichols is writing on the white board he is using a black marker. In the next shot the writing is green, it then black again when Detective Serena Stevens writes on it
Nichols threatens to charge Moira Boyle with being an "accomplice after-the-fact" for hiding her son from the police even though she knew he had a warrant out for his arrest for first degree murder. Hiding someone that has an open arrest warrant for murder, or any felony, would make you guilty of being an accessory after-the-fact, not accomplice after-the-fact. In fact there is no such thing as accomplice before or after-the-fact. In order to be charged as an accomplice to murder (or any felony) you'd have to play an active role in the crime, such as helping restrain the victim so that another person can assault and kill them. Being an accessory is not as severe as being an accomplice, an accessory does not take an active role in the actual crime, they just render aid to the perpetrator either before or after they commit the crime. Rendering aid can come in the form of allowing them to use your car to get to and from the scene, giving them money to flee the jurisdiction, allowing them to stay at your house to avoid arrest or lying to law enforcement about knowing the location of the perpetrator. Someone that is convicted of being an accomplice to a crime will get the same sentence as the person who committed the crime, whereas being convicted as an accessory carries a much lighter sentence, which is usually half the time of the sentence for the crime you were an accessory to.