In that cutscene, PROXY does a dead-on impersonation of both Juno's feminine walk and Starkiller's slouched posture, while both are unaware of him copying their movements.
This exchange during the approach toward the Nar Shadaa TIE Fighter shipyard:
Galen's initial look of shock when Juno gives him a Now or Never Kiss. He really is quite clueless about that stuff.
Considering who he was raised by...
The scene in the novel when Galen uses the Jedi Mind Trick to find out where the captured Rebel Leaders are in the Death Star. Cue him talking to Juno about it while the guard comes to his senses, realizing he's been tricked.
This is somewhat of a meta example, but on the first level of the game, you play as Darth Vader. If you kill 12 Stormtroopers (who you are leading in the assault), you get the following achievement; "Worst Day-Shift Manager Ever". It's also a Chad Vader reference, as Matt Sloan is the voice of Darth Vader.
Another achievement (only present in the Ultimate Sith edition) is for defeating Boba Fett— "And the Quarterback is Toast!"
In The Ultimate Sith Edition, Lord Starkiller Force-choking Captain Keenah.
Captain Keenah: Um, My Lord. Scanners are indicating that the ice caverns through which you travel may be... A bit unstable. It seems that the vibrations of our walkers may be... partly to blame. It is possible that I... overlooked this when planning your infiltration route.
Lord Starkiller: You've failed me for the last time, Captain Keenah.
Captain Keenah: If that is the case, I assure you I take full- (choking sounds)
Lieutenant Marsen: Sir, this is Lieutenant Marsen. I see that you've... relieved Captain Keenah from duty. I'll be acting as your liaison with the battle group.
Applies to both games, but using Force Lightning on a Jumptrooper (or Boba Fett in The Ultimate Sith Edition) will cause their jetpacks to malfunction and send them flying out of control.
Finding Jar Jar Binks frozen in carbonite in Ozzik Sturn's Trophy Room.
During the escape from The Empirical:
Announcer: All escape pods have been jettisoned - empty. Uh, await further orders. (Beat) What? What fool ordered that!?
A small one, if only for the Mood Whiplash it provides: Starkiller is meditating in his quarters, using the Force to put together his disassembled lightsaber, when suddenly Vader’s breathing ruins his concentration. Cue Starkiller frantically (and somewhat sheepishly) trying to pick up the pieces of his lightsaber, almost like a child caught goofing off.
When a Jawa is tossed straight up into the air, it doesn't come back down. Ever. Apparently, Starkiller is strong enough to toss one of them into orbit.
A very dark example, but when Vader is forced to "kill" Starkiller, the Emperor is egging him on in a tone that sounds like he's getting turned on by the boy's pain. Then Vader just chucks him into space, and Palpatine's mood immediately dies with him looking at Vader like, "Really? That's it? Wow..."
After recruiting Kota directly from a bar, Starkiller gives him a rude wake up when he falls asleep on his ship.
Starkiller: I was beginning to worry that you'd died in your sleep... Kota:[groans, clutching his head] Ugh. I'm beginning to wish that I had.
One of the achievements is called "Poor Bob", based roughly on this Penny Arcadestrip.
PROXY and Starkiller saying to each other "I thought you were dead!?" at the same time.
Princess Leia's databank page. A few of the others qualify, too.
From the novel, after Starkiller tries to justify why finding Juno is more important than helping the Rebel Alliance.
Kota: You sound like a teacher I once had, and you make about as much sense as he did.
Boba Fett's database entry is the Empire's dossier on him. It notes that he would be of great use to the Empire, if he could only stop disintegrating everyone.
Also from the novel, Juno telling Princess Leia to watch out for the bad boys when looking for a date. A certain Lovable Rogue would like to disagree.
When Starkiller makes it to the Arena and has a little chat with Kota, the Baron orders the Gorog released. The gate opens, Starkiller drops into a combat stance and out comes a Rancor. Starkiller immediately relaxes, even smiles a little "What, this is your impressive monster?" smile. And then the Rancor gets flattened by a massive hand and things get serious.
Starkiller seeing the Gorog for the first time and his conversation with Kota afterward.
Starkiller (to Kota over the com): No time, general. What the hell is this thing?