Thanks for posting this script! After reading, it seems that this one went to screen with relatively few changes; mainly streamlining the dialogue. A car chase at the end was dropped, but the biggest change is to the Bat-trap; I'm guessing it was easier to film the way it ended up, with only Robin on the -ugh - "Batmobile" (they didn't bother to split or hyphenate it in the script, and it's just as clunky on the printed page).
Baby Jane's first-draft comments in her opening scene scene make it rather obvious that she has a "thing" for artists - "isn't he a doll?" "A real sweetie" "What a hunk of Americana". She also became heiress to the "paper clip fortune" rather than the "Hula Hoop fortune" - doubtless someone figured the folks at Wham-O wouldn't have cared for that - and Davinsky's monkey must have been a later addition

And now we know the pink stuff that Robin takes a nose-dive into - almost getting de-masked - is supposed to be salt-water taffy!
Line We're Glad Wasn't Depicted On Screen Award goes to what Joker was described as doing to a drumstick in Scene 128.
Continuity clanger: Batman's chest after the Joker "signs" it; looks like "CR" for Cesar Romero?
And at Commissioner Gordon's office, it's clearly a J:

"To the medical eye, such childish claptrap means only one thing, young man: You need some sleep."