When BT-7274 gets abducted by a manipulator arm, the loading screens from that point until Jack Cooper re-unites with the Titan are status reports from BT of repeated escape attempts that failed (upwards of 75 times), to the point where even BT starts to get exasperated. Eventually, the AI decides to "reevaluate" the definition of "shortcuts".
This apparently leads to a phobia of shortcuts for BT. At the end of a rather hassling escape, he simply states "I have concluded we should take no further shorcuts." Later on, Jack can tell BT not to get captured again, to which he replies "I will avoid all shortcuts."
In the next level, as Cooper continues to find a way to rejoin BT, he comes upon a large scale IMC factory: an evil interplanetary Mega-Corp who crushes dissidents on a daily basis is building houses... en masse. BT and Cooper catch on pretty quick that it isn't for colonization purposes.
The image of Major Anderson's corpse in the loading screen after discovering the top half of his body is undiluted Black Comedy: it looks like the man Face Planted far too deep into the concrete with his legs up in the air.
Let's be honest here; how many of us didn't use the Grizzly Op device in a peaceful situation, find out the other timeline's version of that area is crawling with baddies or on fire, and then immediatelyshift back over?
Right after you got the Arc Tool, there's a room with a large fan yet to be activated and several work robots walking idly on it. No points for guessing what happened next...
Following the first Fastball Special courtesy of BT over a gorge at the comms relay, one of Cooper's dialogue options is "I think I'm going to need new underwear" after what just happened to him. Selecting this and BT will dryly respond that the Militia should provide some for the next supply drop.
Cooper fights his way to get a fresh module for the communications relay, makes it to the top of the dish, and slots it in. The dish turns to face the militia fleet... and unceremoniously dumps Cooper right off a cliff. Luckily, BT is there to lend a hand.
At the end of the segment after Cooper slid off the comm relay dish and BT successfully catches him, Cooper give BT a thumbs up. BT is visibly confused for a moment before returning the gesture.
Soon after, a MRVN robot gives Cooper a thumbs up as well - perhaps BT has passed the notion onwards.
This possible exchange after finding the first weapon upgrade, 'Tone':
BT-7274: Pilot, this Titan weapon is an advanced design, and may give us tactical advantage.
The "Marvin's Finest Hour" faction, led by a default M.R.V.N. android. The story is apparently its owner went out on a Moonshine run and left his M.R.V.N. to take care of some new recruits until he came back, so it did. Right into battle. That was three years ago, and its owner never came back. And yes, it's suspiciously possible that the M.R.V.N. actually belongs to Barker.
One of M.R.V.N.s intros has it attempt to set up a high-five, only to droop down dejected when the pilots don't reciprocate. This is even more Hilarious in Hindsight when you know that players were actually asking Respawn to let them high-five MRVN on the way out before the patch was released. Even since the first game!
In Multiplayer, when a Monarch Titan performs its standard execution on an Auto Titan (a.k.a. the execution that normally pulls out the other Titans' pilot and crushes them in the Monarch's hand), it has a rather humorous Quizzical Tilt when it realises that it's not actually holding the enemy Pilot.
The "Shadow Boxing" Execution for Holo Pilot, where the pilot creates a succession of Holograms to throw jump kicks at the victim to make them flinch, and using the distraction to draw a pistol and shoot them in the head.
The Pulse Blade is a pilot tactical option that, when thrown, sends out a pulse that marks all targets in the vicinity. The blade itself also does damage to whoever it hits, and if you hit a critical spot, it can even damage Titans. Should the circumstances allow it, this means you can essentially kill a walking tank with athrowing knife.