Barbara tells Commissioner Gordon that she was unable to call the police because Louie's goon ripped the telephone cord out of the wall. However, previous episodes establish that she has an extension in the bedroom that would have been unaffected.
Robin tells Batman that he told the police they would take Louie to jail. However, the Batmobile is a two-person vehicle that can transport three people only if the passengers squeeze together. That would prove very uncomfortable with Louie covered in mold, and would have been unnecessary, since the police were taking away the other criminals.
Louie the Lilac, comments that Batman usually parks the Batmobile in an ally by police headquarters, yet as we've seen every single time before, Batman always parks in front of police headquarters.