Comedy spy movie (probably with Leslie Nielsen) [closed]

I remember 3 scenes from a movie which is in the style of Leslie Nielsen's spy-agent comedies.

Beginning of the movie - He thinks someone is watching him while he walks down the street. He stops, (probably leans down to fix his shoelaces) and then uses the gadget - a small nail-mirror inside of his thumb.
He is asking someone to get on the roof of the building where the conversation will be more secure. 4 helicopters then take off and produce noise (and wind) and as it proves unpractical and deadly - he/or someone else suggests something different.
They get into some hi-tech chamber (almost like small submarine) which mutes all voices and sounds - but - instead of voice, they can see the words and letters they say. And in comedy style - one of them eats some of those letters.

Does anyone remember the title of this movie? It is from the 80-90s, maybe 2000's.

Best Answer

My guess is Get Smart, Again!(1989). Don Adams was the agent. #2 and #3 sound like variations on the running joke of the "cone of silence". This movie featured the variation called "hover cover", where several helicopters hovered nearby to drown out the sound. The third one is the classic "cone of silence", but with a kind of subtitle feature.