Blonde transvestite hooker DaVinci and his brunette transvestite hooker friend are forced into Patrolemen DiSimone and Dresher's police car. When DiSimone, DaVinci and DaVinci's friend are in the back seat, Dresher orders DaVinci into the front seat for implied fellatio. Later, at the police station, DaVinci erroneously says it was DiSimone who forced him to perform fellatio.
When the first victim gets stabbed blood is shown running off his shoulder but the knife is spotless.
Just before the first murder happens you can see the blood tube for a few moments as the first stabs are going into his back.
The close up of the last body, you can clearly see his heartbeat in his neck for a few seconds.
Officer Steve Burns is a heterosexual man with a girlfriend, yet he is required to participate in Gay sex trysts with random men in order to catch a serial killer who kills Gay men during sexual encounters. Burns could not avoid engaging in Gay sex acts if he hoped to catch the killer. There is no way any "straight" police officer would ever accept such an assignment, or even be asked to do so.
The medical examiner discusses the serrations in the wounds of a murder victim but the killer did not use a serrated knife on him. - - - Yes, the killer did indeed use a serrated knife.