Attention Deficit... Ooh, Shiny!!: In the second episode, Salad Fingers is distracted by a rusty nail in the wall while holding the oven door open, and lets it shut on the kid he asked to grab his fish for him.
Breaking the Fourth Wall: Some of the episodes begin with Salad Fingers greeting the viewer, and explaining what he's up to that day.
"Today I'm going to try and find France, because I've always wanted to go there."
Break the Cutie: Even though most people find Salad Fingers scary rather than cute, in Episode 8, when Roger reduces Salad Fingers to a sobbing, moaning miserable wreck curled up in the fetal position in his safety cupboard, you can't help but want to give the poor guy a hug.
Brief Accent Imitation: Salad Fingers does this at least twice, randomly speaking French in one episode and Jeremy Fisher's "strange dialect" in another.
Brown Note: Roger the radio uses these to upset Salad Finger's insides.
Call Back: Milford Cubicle's corpse is still hanging in the wall in "Birthday".
Call a Rabbit a "Smeerp": At least to Salad Fingers. "Red water" = blood, "nettle carrier" = baby carriage, and "floor sugar" = sand, to name a few.
Chest Burster: In episode 9, Salad Fingers feels deathly ill immediately before a slimy black mass bursts from his abdomen.
Cloudcuckoolander: This one can depend on interpretation. Salad Fingers seems to live in a world that's just as bizarre as he is - but then again this could all be in his imagination anyway.
Companion Cube - Several. The finger puppets Hubert Cumberdale, Jeremy Fisher, and Marjory Stewart-Baxter. Also, Horace Horsecollar (a toy horse) in the sixth episode, Kenneth (a mummified corpse) in the seventh, Roger (a radio) in the eighth, and Yvonne (a slimy black infant-sized mass) in the ninth.
Creepy Child: The little girl in "Picnic", at least in-universe. She doesn't really do anything scary, but she manages to terrify Salad Fingers himself. The child-like... thing in "Cage" and Mr. Branches from "Letter" may also qualify.
Creepy Crows: A particularly spooky crow appears in episode 5 during the picnic.
Creepy Doll: Any of Salad Finger's three finger puppets can be this. To elaborate, Hubert Cumberdale can become human-sized, gain red eyes, and scream for no apparent reason, as well as randomly turn into a black liquid that burns at the touch. Marjory Stewart-Baxter jealously watches Salad Fingers have a picnic with a little girl through the window. Jeremy Fisher can also become human-sized, stores a weird green fluid in his plugged-up mouth, and can suddenly transform into a second Salad Fingersto get eaten alive by the first.
Crossdresser: Salad Fingers does this on occasion for no apparent reason. At least, it's probably crossdressing.
Darker and Edgier: Episode 10 of Salad Fingers. It features a carnivorous puppet cutting a hole into a horse with its claws, Milford Cubicle's corpse returns only to have the remains consumed, leaving the skeleton behind, and lastly five other Salad Fingers-like beings were eating his remains. Salad Fingers's mannerisms are also slightly more darker this time around as well.
Deus ex Machina: Salad Fingers escapes from the "little boy" who put him in a cage to propose to him by dropping a curtain and then apparently flying away on a giant tap.
Ear Rape: There are many sudden loud noises, drawing the viewer into a sense of paranoia. Translation: Don't listen with the volume up high.
Extreme Omnivore: Salad Fingers will eat stuff like finger puppets, sand, and hairs on scotch tape.
Eye Scream: Not exactly graphic but still enough to make you shudder. During episode 8, Salad Fingers takes a strand of hair and slowly drags it across his eyeball.
Fan Disservice: Salad Fingers without his shirt on: emaciated and hairy with a scar on his abdomen. Squick.
Depends on the fan. There's fan art on deviantART with him shirtless. (But they made him look less squicky.)
Fetish: Spoons, rust, hypovolemia, and nettles are apparently this to Salad Fingers.
Freak Out - Salad Fingers, on a regular basis. Such as when the little girl speaks to him in episode 5, or when he's at the toilet in episode 6.
Regarding the little girl freakout, an interesting way to look at it (and likely the genuine one): Salad Fingers only imagines the noises that he hears, or makes himself. Because he is insane, he must feel like he's truly all alone, and deserted. When the red-haired girl speaks, he is disturbed and alarmed because he realizes he is in reality, and she is human. You'll notice that after this episode, all the other episodes include Salad Fingers having bad memories, crying, and being afraid. The little girls voice, is what snaps him into reality. Credits go to a comment on YouTube.
Particular mention goes to the ending of episode 6, where Salad Fingers walks into his house and sees a doppelganger sitting in a chair. The Salad Fingers sitting down accuses the standing Salad Fingers of 'deflowering' his daughter's rose. The standing Salad Fingers morphs into A life size Jeremy Fisher, goo trickling from his mouth. The sitting Salad Fingers remarks about not tasting him, and proceeds to eat the normal Salad Fingers head. It's never explained which Salad Fingers as real.
Everything that happens after the pole shows up in Episode 10.
Mummies at the Dinner Table - Salad Fingers digs up the corpse of his brother Kenneth and has dinner with him - assuming that was his brother, and he wasn't playing a macabre imagination game with whatever/whomever was lying around.
Nice Hat: Salad Fingers wears a beret when he wants to visit France. Also Hubert Cumberdale Barbara Logan-Price and his bosun hat.
Horribly subverted in "Birthday" with the hat made with Milford Cubicle's skin
Obliviously Evil: Salad Fingers tends to kill people (and animals, and puppets) without even noticing.
The "people" part is debatable. The only humans who have died in the series have been the boy who got stuck in the oven while Salad Fingers was passed out, and the man who died from banging his head on the door. Salad Fingers can't really be said to have killed either of them, though he's certainly oblivious enough to be capable of this.
Scare Chord: By Hubert Cumberdale in the meat locker scene in episode 2. Also by baby Yvonne's "birth" in episode 9.
Scenery Gorn: Unless Salad Fingers is daydreaming, the setting will be a desolate wasteland full of weird, unintelligible creatures. The only plants are dead trees, weeds, and nettles. Also Salad Finger's house is dark, severely dilapidated, and filthy.
Silent Partner: Salad Fingers's three finger puppets, as well as Horace Horsecollar.
Salad Fingers's copies/twins don't talk or even aknowledge him.
Shout-Out - Salad Fingers' telephone has the Aphex Twin logo on it, and Aphex Twin's song "Avril 14th" can be heard at the end of episode 4.
Surprise Pregnancy: Possibly in episode 9. Salad Fingers feels deathly ill with an affliction that makes him pale, seep a black fluid, and have a pulsating distended abdomen. Then a black blob bursts from his abdomen. After he regains consciousness, he happily accepts the slimy mass as his newborn daughter. However Salad Fingers may just be delusional as usual.
When Hubert Cumberdale, a usually mute finger puppet, becomes human-sized, gains red eyes, and screams at Salad Fingers, Salad Fingers nonchalantly knocks Hubert Cumberdale on the head with a rusty spoon and continues to sing "Somewhere Over The Rainbow".
The two normal human characters in the series go along with Salad Finger's requests (getting a fish out of the oven and joining him in a picnic) despite him being a creepy green man.
To be fair, other than those two kids themselves, Salad Fingers is the least creepy creature we see roaming the wasteland.
Too Dumb to Live: The armless guy in episode 3 who runs after Salad Fingers after he takes a baby carrige. Since he doesn't have hands, he bangs on Salad Finger's door with his head, even though he still has his legs. By the time Salad Fingers investigates the noises, he dies of blood loss.