Gaffes

After Beck is attacked and beaten by the three guys that Sophie hired as he leaves the college one evening, Melissa helps him back to his room inside and he shows her the long, deep gash in his right arm that he tells her she must stitch up, but his jacket and shirt sleeve were intact and clean on that same arm as he and Melissa entered his room. If his arm had been injured that severely, his jacket and shirt sleeves on that arm would have been torn and bloody.

When Sophie was shown putting the corpse in the driver's seat of her car in the alley - as Melissa was telling Beck how she and Sophie had set him up, the corpse was flexible and easily bending in a sitting position as a living person's body would be. But in actuality, the corpse would be too stiff by that time from the embalming fluid to be put in a sitting position in the driver's seat.

Near the end, the detectives promise Melissa and Sophie that they'll make sure that Doctor Beck goes to jail for life. No law enforcement officer could possibly guarantee that. A jury and judge would decide his verdict and sentence.