Stupidity: Batman should've noticed the pink pants the bat creature wore when it attacked him in the zoo thus showing it wasn't Kirk Langstrom. He's noticed things in other fights.
Suggested correction: Are you suggesting Kirk couldn't change his pants?
Well it'd seem ridiculous given his changes probably happen at any time like The Lizard's who also never changes pants.
So Kurt Conners and Kirk Langstrom both wear the same pants for the rest of their lives? They never change clothes when in human form?
Plot hole: It's never explained: 1. How or who helped Scarecrow escape from his cell or 2. Why he'd be sitting in there at the end in costume instead of prison garb.
Suggested correction: Something not being explained is not a plot hole. The manner in which Scarecrow escaped his cell isn't essential to the plot, and therefore doesn't require an explanation. And the reason he's left in the cell in his costume is for the same reason Batman was left wearing his outfit when he was imprisoned: because the doctor at the asylum felt removing his outfit in his hallucinatory state could cause him to become catatonic.
Plot hole: It's never explained why Batman would interrupt the procedure that could've saved Clayface's life.
Suggested correction: A plot hole is when there is a logical inconsistency that benefits a story despite not making any sense. Something not being explained is not a plot hole. And the reason Batman interrupts the procedure is because Clayface is a criminal who has committed numerous robberies as of late, and Batman is there to apprehend him. As far as Batman is concerned, if Clayface wants to undergo the procedure, then he must do it while in custody.
Stupidity: Kyodai Ken has no reason to take Summer Gleason back to his hideout. He could've dumped her off in an alley.
Suggested correction: He abducted her to ensure that Bruce would show up.