1. Judge Doom was originally going to be the hunter who killed Bambi's mom
Thought Judge Doom couldn't possibly be any evil-er than he already was? Between having murdered Eddie Valiant's brother, plotting the destruction of ToonTown, and gooifying that poor shoe RIGHT IN FRONT OF EVERYONE, you'd think that would be enough evil for one villain...but the original screenplay of Who Framed Roger Rabbit? (then titled Who Shot Roger Rabbit?) thought it needed one additional detail: murdering Bambi's mom.
It's a throwaway line, but uh ABSOLUTELY a key one:
You wanna know? Well, since you're so
goddamn curious, I'll tell ya. One of
you Toons killed my brother.
A Toon? Noooo.
Yeah, a Toon. It was the guy who
killed Bambi's mother.
Him? Oh, he was vile, heinous,
despicable... a smear on the drafting
Why was it removed? No one involved has really commented on it, but maybe the idea that an insane, wacky-as-hell psychotic Toon would have felt a little, uh, COMPLETELY INSANE in the world of Bambi?
...or maybe because the hunter who killed Bambi's mom was OBVIOUSLY Gaston?
2. Up's opening sequence was about Ellie and Carl punching each other repeatedly
The opening sequence of Up has gone down in animation history as one of the most touching, gut-wrenching sequences in cinema, and an incredible example of the power of visuals and music, as most of the montage occurs without a single word being spoken. It's simple, it's beautiful, it's tragic, and it was almost about Carl and Ellie punching each other repeatedly for the span of their lives.
Instead of a purely romantic and simply-told story of a life well-lived, there was originally an additional element to the relationship of the Frederickburgs: PUNCHING. Instead of meeting in a treehouse, commiserating over their love of adventure, the first plan was to have Carl trying to trap a bird, and Ellie punching him for bein' mean to said bird. This set off a "kids flirting via violence" sequence where the two would try to surprise the other with a sock to the face when the other was least suspecting it.
Even in their final moments together, when Ellie is on her deathbed in the hospital, she lightly punches Carl in the shoulder (although this is supposed to be heartwarming and sweet, not an escalation of their Punch-Competition).
Why did they remove the punching from what is now known as the sweetest, most tear-inducing sequence in modern cinema? Per director Pete Docter:
"We showed it and there was silence and people were sort of shocked. [...] They thought it was too violent or something."
Probably the right move.