It's single words or phrases but I think it's happening more often now that actors don't care about proper diction, or for some reasons are no longer filmed until they they say their dialogues clearly.
Proper diction?
Is that Mid-Atlantic accent, Received Pronunciation, or something else?
It's lisping, various mannerisms, speaking too fast - sometimes all at once - which I seem to have issues with understanding. Not an English native but I have less problems with understanding oldschool actors.
Sean Connery had a particular way of pronouncing words but his speech was flawless. Bruce Willis has his speech impaired these days and he's speaking more slowly but is recorded until he sounds right. Younger actors say "blahblehboo", smile cutely and this hits Netflix screen.
My dad had to learn all these specific ways to enunciate and they made them do practice work. He was in communications in the military and later for the whitehouse and then radio and TV after the military.
It is interesting to see differences over the decades.
Also, it would be cool if peoples speech would not be impossibly while explosions so loud, everyone in other rooms or even apartments can hear it.