Memory
Memory is one of the major themes of the play. We listen in as Deeley, Anna and Kate take us through memories that begin to take shape as memories of one another even though they seem to be talking about people who aren't present with them. This relates to how one person's memories can be different to another's of the same moment in time.
Loss
Kate found Anna dead in her bed. The play evokes the feelings and memory created after the loss of someone we knew, or had met. Loss causes us to think in a focused way about a single individual, allowing us to dredge out things that we didn't know were there or are still there.
True and False
Pinter uses words in such a way that one moment in time becomes true to one character and false to another. This play on a moment has to do with the interpretation by the individual, what they felt. And, then contrasted with the feelings and experience of another person in the same moment.