Music from the promo is reused when Raven and Starfire are riding their bikes.
The Titans have to travel to the top of Mount Bro-suvius to stop the Bro-Pocalypse from happening. Bro-suvius is likely a portmanteau of an actual mountain, Mount Vesuvius, which has erupted many times in its history and caused much catastrophe.
The scanners later indicate that Mount Bro-suvius is actually Mount San Antonio, the tallest point in California.
The Bro Journal appears to be written in a form of hieroglyphics, or hie-bro-glyphics.
Raven is unhooded for the 76th time.
This is the second time the girls compete with the boys. The first time is in "Boys vs Girls".
This is also the second time that the girls have to handle a situation since the boys fail to do so and get into a plight instead. The previous time is in "Operation Dude Rescue".
This isn't the first time that Robin, Cyborg, and Beast Boy have bro'd out. In the episode "Caged Tiger", the boy Titans have recently returned from a bro weekend, and their bro antics also annoy the girls.
In this episode, Raven and Starfire disapprove of Cyborg, Beast Boy, and Robin wearing their hats backwards. But in "The Gold Standard" they were willing to use their leprechaun wishes to turn their hats first to the side, then fully backwards.
Starfire and Raven come across an inscription that reads "Non Sine Frater Fratris Fratrim" which loosely translates from Latin to "Not without my brother, brother". The fact that the inscription is in Latin may be a reference to college fraternities which use Latin letters for their names and are where bro culture comes from.
The title "Bro-Pocalypse" is a reference to 2014 Gamergate controversy between feminists and the predominantly male video game community.
Beast Boy tries healing the leg injuries that he, Robin, and Cyborg suffer from using reiki, a Japanese healing technique that he likely saw Mr. Miyagi use in the first Karate Kid movie.
Starfire asks if being a bro would not be as simple as to "Don Cornelius" the clothing of the bros. This is a reference to a former creator and host of Soul Train.
To inspire his bros to work past the pain, Robin mentions Tiger Woods '08 U.S. Open victory which he achieved with a broken leg and an injured knee.
When Starfire makes Robin, Beast Boy, and Cyborg's hats face forward, the next scene with them shows the hats facing backwards.
The Titans constant use of the words "Bro" and "Bros".
Cyborg, Robin, and Beast Boy constantly injuring themselves.
Starfire and Raven acting like "bros".
The transcript for "Bro-Pocalypse" can be found here.
The image gallery for Bro-Pocalypse may be viewed here.