Commissioner Brumford: [On phone.] Hello? He did what? How many animals escaped? Oh, my god.
Frank: Hello, Commissioner. You're looking lovely this evening.
Commissioner Brumford: Do you realize that because of you this city is being overrun by baboons?
Frank: Well, isn't that the fault of the voters?
At the conference, when the President is announced, there is a wide shot of the crowd and you see a lot of people standing in the background against the wall. There are also several spotlights turned on. Then it cuts to the stage where Frank and the squad are walking. When it cuts back to the crowd all the people in the background are gone and the spotlights are switched off. The crowd reappears later and the spotlights are on again.
Parody singer Weird Al Yankovic had cameo appearances in all three of "The Naked Gun" movies, but in this one he was in an 'unrecognizable' role; namely as the thug who holds the Police Squad at gunpoint until Frank opens the door, inadvertently knocking him out.