From the shot where Martian Manhunter and Zatara were first seen arriving at the Cadmus building to the next, both characters swapped positions.
Just as the Cadmus building started collapsing, Blockbuster appeared to be electrocuted - even after Aqualad (who made the attack) had left. The chalk marks drawn by Robin and the water puddle from Aqualad have also disappeared.
Batman: Is that what I think it is?
Kid Flash: He doesn't like being called an "it".
Aqualad: Superboy! We're going to escape, not to bury ourselves here!
Superboy: You want escape?!?
Kid Flash: What? What do you want? Quit staring. You're creeping me out!
Robin: Uh, K.F., how about we not tick off the guy who can fry us with a look.
Kid Flash: He can talk?
Superboy: Yes. "He" can.
Kid Flash: Not like I said "it."
Superboy: I live because of Cadmus. It is my home!
Robin: Your home is a test tube. We can show you the sun.
Kid Flash: Uh, pretty sure it's after midnight. But we can show you the moon.
Mark Desmond: Activate the cloning process.
Robin: Pass. Batcave's crowded enough.
Kid Flash: You here to help us or fry us?
Superboy: Huh. I don't seem to have heat vision, so I suppose helping is my only option.
(after freeing himself from handcuffs)
Robin: Finally. Lucky Batman isn't here. He'd have my head for taking so long.
Kid Flash: Seriously? That's what you're worried about? The whole League'll have our heads after tonight!
Robin: That guy is not whelmed. Not whelmed at all.
Kid Flash: What is it with you and this whelmed thing?
Superboy: Superman can fly. Why can't I fly?
Kid Flash: Don't know. But it looks like you can still leap tall buildings in a single bound. Still cool.
Character bios: Blockbuster, Miss Martian
When this episode premiered, it aired as a two-part "feature movie" along with Part 1 immediately preceding, and no credit breaks. When it was repeated in its original timeslot, it was titled "Fireworks."
Heroes appearing without dialogue: Red Tornado, Captain Marvel, J'onn J'onzz, Zatara, Captain Atom, Hawkman, Wonder Woman, Hawkwoman, Green Lantern (Hal Jordan), Green Lantern (John Stewart), Black Canary and Green Arrow.
Kid Flash: It looks like you can still leap tall buildings in a single bound.
This is an allusion to the well known description of Superman's powers in the radio serials and Max Fleischer animated shorts of the 1940s, as well as the TV series of the 1950s. ("Faster than a speeding bullet, more powerful than a locomotive, able to leap tall buildings in a single bound!")
Kid Flash: Come and get me, you Incredible Bulk!
This is referencing the Marvel comic book character created by Stan Lee and Jack Kirby, first appearing in The Incredible Hulk #1 (May 1962). Scientist Bruce Banner is exposed to gamma radiation and under emotional stress transforms into a super-strong green behemoth known as the Hulk. The character has gone through various incarnations over the years, spawned a live-action TV show and various animated shows, and feature movies.