Can you be more specific?
There are times when the staging deliberately obscures conversations or pieces of conversations -- in my assumption, to give the audience the experience of the exclusion and disorientation of the main character, who is deaf.
The actor who plays the main character is also deaf -- deaf from birth, I believe -- and so his diction and pattern of speech is markedly difference from the hearing actors in the play. Admittedly, I may have missed the odd word here or there, but definitely nothing that impeded my comprehension and definitely nothing that a little bit of focus and concentration couldn't fix.
However, I'd also suggest that if either of these things are enough to make you hesitant to see this play, then perhaps this play is not for you.
CHURCH DOOR TOUCAN GAY MARKETING PUPPIES MUSICAL THEATER STAPLES PERIOD OIL BITCHY SNARK HOLES