A soft-landing mat can be seen to the left of the frame when the first mobster is thrown out of the Locksmith's shop.
Shadow of boom microphone visible on wall behind Frank Drebin when he gets up to leave after getting information from Johnny.
Inside the locksmith shop, Norberg (Peter Lupus) and Drebin (Leslie Nielsen) are busy at the counter and were supposed to remain oblivious to the place being pelted by gunfire. However, Peter Lupus is seen reacting to it due to the explosive charges planted in the set discharging small chunks of plaster into his face.