Plot hole: After his mother's death, Peter sets a camera up outside her therapist's office, so he can see who goes in and who comes out; he thinks his mother's killer might be one of the doctor's patients - a tall woman with long blonde hair. All he sees is people going in and people coming out, and then he sees her - the tall blonde. Problem: He never saw her going in, only going out, which is critical, because the killer is the therapist - a tall man - wearing a long blonde wig and make-up. Of course no-one says anything about "We never saw her going in, only out, so it must be the therapist!"
Dressed to Kill (1980)
2 plot holes - chronological order
Directed by: Brian De Palma
Starring: Michael Caine, Nancy Allen, Angie Dickinson, Keith Gordon, Dennis Franz, David Margulies, Ken Baker, Susanna Clemm
Plot hole: After his mother's death, Peter sets a camera up outside her therapist's office, so he can see who goes in and who comes out; he thinks his mother's killer might be one of the doctor's patients - a tall woman with long blonde hair. All he sees is people going in and people coming out, and then he sees her - the tall blonde. Problem: He never saw her going in, only going out, which is critical, because the killer is the therapist - a tall man - wearing a long blonde wig and make-up. Of course no-one says anything about "We never saw her going in, only out, so it must be the therapist!"
Trivia: This film's ending mirrors that of "Carrie," another film that this movie's director, Brian De Palma, made; at the end of "Carrie," Susan Snell has a dream of visiting the wreckage of Carrie White's house. Then Carrie's hand pops out of the ground and grabs Sue's arm. Susan wakes up screaming and is comforted by her mother. This film ends with Liz having a nightmare about Robert escaping from the institution, coming to her home and killing her. Liz wakes up screaming and is comforted by Peter.