I have not seen the film or read the book, so did not have them to compare to. I knew it was about a lady, with early onset dementia. I imagine the book features some first person, so Alice voices what is in her head. In this play, there is an actress following the character of Alice who voices some of the thoughts in her head. This device was used sparingly. To some extent it needed to be, because the voice of her thoughts could not overlap, the other characters talking on stage. However, it did not give depth to her thoughts and reflect how complex someone’s thinking is.
The play was an hour and a half straight through, therefore limited time to develop characters and plot. It was a pleasant watch, but for me lacked poignancy.
A previous post about early onset dementia.