Fred Wood's fleeting cameo as the parade spectator wearing a flat cap and fingerless gloves. Also, the cameo by Guy Standeven as an audience member at the rally in the town hall.
You've seen Guy Standeven in something because the man was in everything.

Kung Fu thug kicking and flipping around his swords, seems to move in on rollers, takes a few swipes at Batman, then is kicked in the chops out of nowhere!

http://scifiblogs3.blogspot.com/2012/12/batman-forever.html

http://www.childrenofrassilon.com/batman-forever.html

• Batman Homage

You can't make an omelette, without cracking a couple of eggs.

Obviously there's so many Just from an artistic/cool perspective, this scene always gets me:
After the strange mime Joker assassinates the mob boss with the lethal pen, he turns and takes his hat off for the crowd (Elfman's haunting score kicks in just for this vague moment). He says "The pen is truly mightier than the sword!", then Elfman's score is immediately muted by blazing Tommy Gun fire bringing the crowd to the ground in panic.
I love it because he says "the pen is truly mightier than the sword" only before his own goons use machine guns. Both gestures of the lethal pen and machine guns completely void his statement.

Just a few lines of Jack's that spring immediately to mind;

1. "I like him already!"
2. "Hey Eckhardt! Think about the future!"
3. "Better be sure"
   "A big ball of wibbly wobbly, timey wimey stuff"
   The Tenth Doctor explains all.

Favourite moments for me?
Jack Nicholson
Michael Keaton
Kim Basinger
Any moments they had.
Also Alfred. And Gordon. (I could not for the life of me spell his rank in the police force)
Bob the Goon also.

"What future? You ain't got no future Jack! You're an a1 nut boy and Grissom knows it'.

"Nice outfit." Even Batman had to smile at that one.

"You killed my parents"
"What are you talking about?" Nicholson's brilliantly desperate Joker, mouth bloodied, hand in pain from trying to strike Batman, is worried that the game is up.

Getting dropped in the vat.
On the roof with the thugs.
The Batmobile going into the secret passageway though Vicki Vale thought they were going to crash.
And now, folks, it's time for "Who doyou trust!

"You wanna get nuts?!? Let's get nuts!"

Nice choices!

1. "I'm Batman."
2. Batman appearing above the two thugs, spreading his cape before jumping down and being shot by them and rising back from the dead.(I guess this could qualify as two moments)
3. Batman crashing through the Flugelheim Museum skylight.
4. Batman stealth-backhanding a gangster at Axis Chemicals.
5. Joker's newly-bleached hand rising out of the sewer water.
6. "I'm glad you're dead!"
7. Jack/Joker's shocked moans gradually morphing into laughter at the plastic surgeon's office.
8. The Batmobile driving through the exploding Axis Chemicals with flames all around it.
9. Batman standing in front of the big AXIS sign, turning and running away.
10. Batman standing atop the scaffold looking at the Bat Signal.
11. "Never rub another man's rhubarb!"
12. The weird sounds Joker makes while sitting at Grissom's desk before bursting out in laughter.