The surveillance of the ship suspected of carrying illegal immigrants occurs during bright daylight, but the CCTV monitors visible in the back of shot at the station's front desk when Blakemore and Johnson are speaking on the radio are showing that it's night outside the station.
It was mentioned that the Glass Goldstein was stabbed with was held by her and put in evidence. Finger prints would lead to the arrest earlier to the murderer as the murderer would have had his fingerprints taken for being charged for the passport scam.
The Murderer of Rachel mentions that she recognised him in his confession . You would think she would tell Jack who it was. Although she did also think Jack was Frank.