Spoilers Off per wiki policy. Investigate at your own risk.
Gameplay
Various characters will have different reactions to Brok/Graff walking on top of a table/desk or jumping on a bed for no reasons. There are even achievements for doing so, titled "The World is My Doormat" and "Master of Mattresses" respectively.
Brok's visit to the Pharmacy on Drumers Street are full of chuckles-worthy moments, ranging from him claiming that his extra weight is actually due to his muscles and not fat to his exchanges with the cheerfully blasé feminine-voiced AI there. Whenever he takes a look at the highlighted products on the left, they are, to quote the AI, "automatically" added to his shopping cart, even though he had no intentions of buying them (on account of his state of Perpetual Poverty). When Brok tries to take his leave, the AI informs him that he doesn't have enough Unis to purchase the items in his cart and offers to let him pay using credit, causing a frustrated Brok to demand it clear his cart and opt out of automatic checkout. The poor croc dude is practically drained at the end of the whole ordeal.
In the Trasher Hunt room, you can walk over to the window overlooking the scenery and repeatedly punch it until it breaks. This serves no purpose at all, and even Brok is confused that this happened. To add insult to injury, if Brok reenters this room later, he'll have to fight off Tribots or pay 200 Unis as punishment for vandalism.
Brok: ...Why did I do this?
Tribots are modeled to resemble cats, having the ears and tails. Police Tribots scream and dash away if you get close and don't hit them in time, since they prefer shooting from a distance. In other words, they'rescaredy-cats.
Story
At the beginning of Chapter 2 during the police interrogation, when Wes asks Brok what his name is, Brok can answer by sarcastically saying "Hot Dog." The lie detector will not shock Brok for saying this, confusing everyone in the room.
During the Interrogation process to expose the true culprit behind Dr. Hush's (supposed) death in Chapter 4, Brok can say that Dr. Hush has died and is now a ghost to explain how he ended up in Dr. Mink's room despite the records showing that he never entered it. Nobody is amused at Brok's Cloudcuckoolander reasoning.
This exchange during the final confrontation if the player chooses this as Brok's final words.
Brok: I love you, Wes! Please hold me tight!
Wes (as P-26):(completely dumbfounded) Uuuhh... Not what I expected but... I shall grant your wish!
Endings/Credits
The entirety of the "Cynical" ending. After Brok destroys Shay's time machine with his fists, he gets transported to the apartment belonging to Bjorn, the Loser Protagonist of COWCAT Games' previous title, Demetrios - The BIG Cynical Adventure. After a very, very awkward exchange with Bjorn himself, his neighbor Sandra, and her young daughter, Brok freaks out, closes the door on them, and demands that Shay bail him out. She promptly chews him out for wrecking the time machine that she has spent "half of her life fixing" and informs him that he's forever lost in time. When Brok sheepishly asks her if he can try again, Shay grumpily tells him he can do so "after the credits", to which Brok replies with an enthusiastic "Cool!".
If Brok fails to properly resolve the murder case in Chapter 4, which results in the true culprit getting away with killing Dr. Mink, Dr. Hush, and the Security Guard, this darkly comedic exchange between two Tribots at the lab happens in the Modular Epilogue:
Blue Tribot: Hello Number X1506.
Purple Tribot: Hello Dr. Hush.
Purple Tribot: ...
Blue Tribot: Ha ha. Silly bot. Pathetic joke. Back to work.
Purple Tribot: Of course. (rolls away)
Blue Tribot: Productivity wins. Humans always lose.
