In long shot the clock face is divided into numerous small panes illuminated from behind. (It's a shot of the clock commonly known as 'Big Ben'.) However in close-up when the Bat-grapple catches the hands, the face is a single opaque piece, the hands are smaller and the whole thing looks totally different.
Early in the episode, Chief O'Hara and Batman meet on the sidewalk at night. Chief O'Hara walks past a lamppost and a planted urban tree to meet Batman getting out of the Batmobile. To the Chief's right, the building he is walking toward, and would be standing in front of to talk to Batman, is solid concrete on the ground floor with high windows. Yet when the camera comes in for a closeup of O'Hara and Batman, the lamppost and planted tree are nowhere to be seen, and instead of a concrete wall behind O'Hara, there is a bookstore with brightly-lit ground-level windows. Even if there was a lit bookstore slightly behind O'Hara as he left his car (which is unlikely as no light was coming from his side), no camera angle could have shown him in front of the bookstore in that way, with neither lamp nor tree showing between him and the bookstore.
Both in the previous episode and at the beginning of this episode, the Bookworm's gang contained 5 male thugs beside Bookworm himself and the girl. In the final fight in the alley, there are only 4 male thugs.