Tony Musante was a very intense actor and It's alleged he would frequently show up at Dario Argento's apartment at 3am to discuss characterization, much to Argento's annoyance.

The "Hornitus Nevalis" bird species doesn't actually exist. The one seen in the film is played by a Grey Crowned Crane.

At one point an executive producer wanted Dario Argento removed from the production when he was disappointed by a screening of some dailies. When Argento's father Salvatore Argento went to the exec's office to talk to him he found the exec's secretary visibly shaken. When he asked the secretary what was troubling her she said she saw the screening and the footage terrified her. Salvatore Argento then asked her to go tell her boss about her reaction to the screening. She convinced the executive to keep Dario Argento on as director.

Although 'The Bird with the Crystal Plumage' isn't the first Giallo movie, it is credited for making the sub-genre famous and starting the trend that boomed from 1970 to 1975.

This was the first solo directing credit for Dario Argento.

This played in a Milan cinema for 3 and a half years, such was the film's popularity in its native Italy.

The script to 'The Bird with the Crystal Plumage' was written in 5 days.

Dario Argento wrote the screenplay on spec after Bernardo Bertolucci gave him a copy of Fredric Brown's novel "The Screaming Mimi" although the film is technically not an adaptation of the book.

Director trademark: [Dario Argento] Character recalls clues from memory.

The painting the killer buys from the antique store heavily resembles Pieter Bruegel the Elder's The Hunters in the Snow.

Eva Renzi considered the participation in this movie as career suicide.

Director Cameo: Dario Argento body doubling as the killer. Every shot of those black, leather gloves, as it was far more convenient for him, knowing exactly how to handle the hand movements.

Shot in just six weeks.

This was director of photography Vittorio Storaro's first film in color.

The first installment of Argento's Animal Trilogy (a trilogy of giallo films with animals in their titles). The trilogy includes The Bird with the Crystal Plumage (1970), The Cat O' Nine Tails (1971), and Four Flies on Grey Velvet (1971).

'The Bird with the Crystal Plumage' is one of the reasons why Dario Argento is often referred to as, "The Italian Hitchcock".

An uncredited adaptation of Fredric Brown's novel "The Screaming Mimi". It was previously filmed in 1958 by Gerd Oswald.

Included among the "1001 Movies You Must See Before You Die", edited by Steven Schneider.

Terence Young was originally sought out as director.

Director Dario Argento later cited star Tony Musante as one of the most difficult actors he ever worked with.

Entertainment Weekly ranked this Number Seven on their "Guilty Pleasures: Testosterone Edition" list in their March 30, 2007 issue.

The first of many Argento films that featured an artist as the main character. Sam Dalmas is a writer, while future Argento protagonists would include writers, musicians, dancers, singers and painters.

TV interviewer at end and at least two other voices dubbed by Robert Rietty.

The POV shot used when Alberto Ranieri falls to his death was achieved by actually dropping a camera six stories onto a concrete sidewalk. The camera did indeed break, but the footage was saved.

Eva Renzi was not a fan of the film nor her role in it. In an interview she stated that portraying a character who turned out to be a chuckling, crazed murderer was beneath her talent as an actress.