LEGO DC/Allusions

Bats, Cats, and Birds

 * The title is a reference to Planes, Trains, and Automobiles.
 * Tyler Ferrari and Tyra Beaulieu from Venture appear in various scenes. Beaulieu’s obsession with eating frogs is lifted directly from the spinoff series, Venture: Minis.
 * Man-Bat’s jump scare uses the moan from the “Wombo Combo” meme
 * Mo Bamba is played to frighten Man-Bat.

Ice-Berger’s Syndrome

 * Tyler Ferrari and Tyra Beaulieu return in this episode.
 * Perverted Kid 1, Perverted Kid 2, and Angry Emo Kid are all based on students at Zachary’s school.
 * ”Live or Let Die” playing in the funeral is a Shrek 3 reference.
 * Tony Stark’s eulogy from Avengers: Endgame is used.

Hero Academia

 * The episode's title is a play on My Hero Academia.
 * The fights between Batman and the Toxic Avengers is based on the battle between Spider-Man and the Lizard from The Amazing Spider-Man. A Stan Lee cameo (based exactly on his in the film) was also planned but was left out due to seeming disrespectful to him post-mortem.
 * Originally, Mad Hatter was going to have all of the blood removed by a syringe and have him become flattened, similar to a nightmare sequence in FRED 2.
 * Mad Hatter's death scene is based on the Penguin's in Batman Returns, with them both dying from radiation and blood loss.
 * Violent Kid is based on a student from Zachary's school. Additionally, two girls are seen from the back and are designed after students from Brendan's old middle school.
 * Grapey the Grapeman's name is based on Forky from Toy Story 4. His smiley face-like appearance is also similar to the gingerbread man from SHAZAM.