"Too ra ra's" in Do you want to know a secret
The forced verse "well work it out now HONEY" in twist and shout
The low drums between "Every little thing she does" and "She does for me"
The first verse of "you're going to lose that girl"
The unedited S's and T's of You wont see me
The instrumental climax after I'm lookin through you's chorus
The reverse notes in I'm only sleeping
The hindu music of Love you too
The rhymes in "and your bird can sing"
"feel so suicidal even hate my rock and roll" verses of yer blues
Baby crying sounds in rev #9
Last verse of Oh darling
"sweet loretta fat she tought she was a cleaner but she was a frying pan" intro in some version of get back
"all these years I've been wondering why...." part of I've got a feeling
Guitar solo in Let it be (album version specially, but really in any)

I also like Ringo's little spoken bits like "Rock on George, one time for Ringo" in 'Honey Don't'. Also, when he kind of realizes that 'If You've Got Troubles' wasn't really going anywhere and says "Rock on, anybody".

Tambourine in While My Guitar Gently Weeps (3:23 - 3:29)

Most of those already listed make my list, but my favourite moment is the primal scream leading into the outro in I Want You (She's So Heavy).  Still gives me a shiver most times I hear it, especially as the bass just keeps on doing its thing behind it.

when the orchestra comes in all-badass for the last verse of I am the Walrus. starting with the "Semoline pilchards climbing up the Eiffel Tower" line

The french horn in "For no one"!

The raise in Pauls voice at the end of "Nowhere man"!

the "cha cha boom" in besame mucho!

Paul making the shooting sound in the take of Rocky Raccoon of the anthology! and the "sminkin?" bit!

the "la la la" at the end of misery!

"bob the robert"!

and many more!

Piano on Lovely rita

Beginning of Lucy in the Sky

She Said Sha Said when John says "when i was a boy, everything was riiiiiiiight, everything was riiiiiiight" and also
"and your making me feel like i've never been born"

the chorus on Im only sleeping (during John's "Please dont wake me please dont shake me, leave me where i am" verse)

Strawberry field's (Anthology Version) take 7, near the ending when the drums come in all loud and crazy

on Love You To when George says "but what you got means such alot to meeeeeeeeeeeeeeeeeeeeeeeeee..."

Rocky Racoon's "da da da da da da da da daaa" with the old timey piano
(it's hard to type but i think you know which part im talking about)

and like a  thousand other parts that are too obscure to list  

Quoted from Will Campbell

Most of those already listed make my list, but my favourite moment is the primal scream leading into the outro in I Want You (She's So Heavy).  Still gives me a shiver most times I hear it, especially as the bass just keeps on doing its thing behind it.

Exactly!!!! i know what you mean!