When Scarface blows up the bridge, the resulting explosion is reused footage from the scene of the two Wayne/Lex T-7 droids blow up after Batman electrocutes them.
The establishing shot towards the end of this episode which shows a harbor is actually the exact same shot used toward the beginning of the second episode.
Clark Kent and Lois Lane can be seen in the background at the park in the scene after the ventriloquist goes up the stairs from the subway into the park.