Duality is opposites: good/evil, straight/gay, love/hate, person/doppelgänger etc.
To David Lynch duality is a very broad term. He shows it in mirrors, in colors, in numbers, in repeated words and phrases, in copying things from old movies, in scenes or individual shots that are repeated. Duality is continuing things from one movie to another — whether they are his or not his films.
Duality is opposites, good/evil, straight/gay, love/hate, person/doppelgänger etc. — ctyankee
Parallel worlds
In the 'dream' there is the scene which takes place in the Havenhurst kitchen, by the sink, where Betty wears a pink robe and Rita is in red. They are rehearsing Betty's script: "You're still here? I came back, I thought that's what you wanted? Nobody wants you here!" (Betty says angrily)
In the 'reality' part after Diane wakes up and the woman from #12 takes her box of stuff, Diane walks over to the kitchen sink, in a robe (same style as Betty's but different color) and Camilla pops up, dressed in red — "Camilla, you've come back!" Diane then gets angry and emotional, like Betty's script called for. Diane then takes the place of Camilla and we could see the line of "I hate you — I hate us both —" being applicable here, as if Diane was saying that she hates herself.
Odd that this sequence is shown after Diane wakes up, considering the blatant similarities between the two scenes. It seems like a reflection from a parallel world, almost as if Lynch is showing us that Betty's audition was actually for the role of Diane Selwyn, and after we switch worlds we see Betty playing 'for real,' when it got 'real.' — dropkick23
Visual echoes
Apartment
- Aunt Ruth's apartment complex at 1612 Havenhurst is a "spiffed up" version of the apartments on Sierra Bonita. Note the courtyards and the entryways/doors to all three apartments (Aunt Ruth's front door, and #12 and #17 at Sierra Bonita).
- Similar layout of Havenhurst and Sierra Bonita's apartments: Kitchen–Hall–Living–Bedroom+Bathroom.
Appearance
- The similarities between the Monster Behind Winkie's and the cloaked Louise Bonner.
Blue van
- The blue van the prostitute, Joe, and the pimp get in at Pink's.
- A blue van is seen driving ahead of the elderly couple's limo from LAX.
- A blue van passes by when Rita comes downhill onto Franklin Ave and Sunset Blvd at night, at the beginning of the film.
Car smash
- Adam smashing the Castigliane Bros' limo echoes the car crash at the beginning of the film.
Counter
- Dan looks to see Herb by the counter.
- Diane looks to see Dan by the counter.
Couples
- The assassin with his short blonde hair (Joe) kills his friend with long dark hair (Ed) — a parallel to Diane and Camilla, because they were also friends once.
Drawer
Aunt Ruth and Diane doing exactly the same thing but in reverse:
- When Aunt Ruth returns to the Havenhurst apartment to get her keys, her first action is to search through a drawer before she sees her keys on the table.
- The next (and only other) time a woman puts her hand in a drawer it's Diane pulling the gun out of her bedside table in the final scene — after staring at a key on a table.
Flower
Headlights turning on
- Headlights in Mr. Roque's office turn on as Ray enters.
- Floodlight illuminates the corral as the Cowboy enters the scene.
Key
- The key left by Aunt Ruth to Betty, given by Coco, left on the table by Betty.
- The blue key left by Joe for Diane, sitting on the coffee table.
Kiss
- Camilla + Adam in the '50s car. Camilla glancing at Diane watching.
- Camilla + Blonde Camilla at the dinner pool party. Camilla glancing at Diane watching.
- Adam directs how to kiss Camilla in the car: "and she starts to cry, don't pull her toward you."
- Betty knows how to kiss an experienced actor (Woody).
Limo
- Rita (Camilla) and Diane ride the same limo, on the same stretch, and stop (apparently) at the same location.
- Dialog clue: "What are you doing? We don't stop here!"
- The elderly couple ride a similar limo from LAX.
- The Castigliane Bros have a similar limo too.
Microphone
- Carol's old microphone on the '50s set for "16 Reasons Why I Love You."
- Rebekah Del Rio's old microphone at Club Silencio.
Nudity
- Rita in shower at Havenhurst.
- Rita in bed at Havenhurst with Betty topless. Rita on top of Betty.
- Camilla and Diane topless on the couch at Sierra Bonita. Diane on top of Camilla.
Purse
- Rita's purse contains the blue key / Betty's purse contains the blue box.
- Rita's purse contains the bloody money / Diane's purse contains the hit money.
Phone & lampshade
- Mr. Roque initiating a phone call chain ("The girl is still missing") ending on a phone by a red lampshade.
- Camilla calls Diane on the same phone since "she is still missing" from the party.
Photo résumé
- The photo résumé calls for the blond wig worn by Rita — it shows the blonde Camilla just like she is at the dinner pool party (same earrings, same necklace, same hairdo, same look).
- Blonde Camilla's headshot at the Ryan board, handed out by Luigi to Adam.
- Camilla Rhodes's headshot at Winkie's, handed out to Joe by Diane.
Rug
- Rebekah Del Rio collapses on rug.
- Next scene: the blue box falls on a similar-looking rug.
Sink
- Betty and Diane's breathing at three of the sinks is a special touch.
Tree
- The foot of the red lampshade (phone call chain) and the tree designed on top of the fireplace at Havenhurst.
- A tree foot also appears together with a white shade at Havenhurst in the scene where Rita takes off the blonde wig.