Scrooge is so excited about going out to wish Merry Christmas to the city that he almost leaves only wearing his hat, pajamas, slippers, scarf, and robe. He goes out the door, we hear him go down the stairs, then we hear him come back up the stairs. He reenters his room and says "I can't go out like this!" He grabs his cane and is very self-satisfied that now he's properly attired.
Bob Cratchit getting ready to leave after Scrooge lets him leave two minutes fast.
Bob: Oh thank you sir! You're so kind!
Scrooge: Never mind the mushy stuff, just go!
Also in that same scene, Bob Cratchit's slip of the tongue when he almost says "and a bah humbug" to his boss.
When Jacob Marley visits Scrooge:
Marley: Ebenezer, remember when I was alive how I'd rob from the widows and swindle the poor?
Scrooge: Yes, and all in the same day. Oh you had class, Jacob.
Marley: Hyuk! Yup!...no, no! I was wrong! So as punishment, I'm forced to carry these heavy chains throughout eternity!...maybe even longer.
After over 35 years, Willie the Giant finally gets to say the line most associated with the character he's based upon, even if he's changing the last part just slightly.
Ghost of Christmas Present: Fee fi fo fum, I smell... I mean, I smell... [spies Scrooge] a stingy little Englishman!