Around 44 minutes in,when the detective is leaving Amanda's house with her, he's wearing a light blue shirt, when they arrive at the studio he is now wearing a dark perhaps even black shirt.
When Detective Dawson tells Amanda that Detective Valencia is dead, Liam asks Dawson if they are sure she committed suicide. But Detective Dawson never said that she committed suicide. He only said she was found dead that morning.
Jeanne in the beginning of movie says that she has state of the art security system with cameras and everything. When she comes home opens door and gets Attacked there is no alarm warning her to disarm and nobody ever talks about cameras picking up her attack. It is just left as she is dead and nothing goes further in that plot line.