Deliberate mistake: When Lex busts Joker out of Arkham Asylum, he uses his Deconstructor gun on the LEGO wall. It takes it about 8 seconds to pull the LEGO apart for Joker to get out. The same amount of time is taken when he demonstrates it to Joker and frees Penguin. Yet when Joker grabs it and uses it to free Catwoman and Two-Face, that time is cut in half. And then yet again when they are leaving on the chopper, Joker fires it 3 more times, freeing Poison Ivy, Harley Quin, and The Riddler. It barely takes a single second on each of those. (00:17:40 - 00:19:35)
Continuity mistake: At Arkham after Robin scares Catwoman, Bane's mole machine comes up through the ground leaving a large hole by the tree. But in the shot showing the mole machine leaving with Batman and Robin on the tree, the hole is gone. (00:27:50)
More quotes from LEGO Batman: The Movie - DC Super Heroes Unite
Trivia: When The Joker interrupts the ceremony and shows the video of him blowing up the building, there's a scene where he hits the detonator a few times before the building blows up. This is a scene paying homage to what happened in The Dark Knight when there was an actual unplanned delay during filming of the explosion going off during the blowing up of the hospital.
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