When Louis Waters visits Clarissa Vaughan, she gives him water with ice and a lemon, in later shots you see neither a lemon nor ice, and later you see just a lemon and no ice.
Prior to Clarissa's party setup. there are plain-backed folding chairs stacked against the wall near the front door. After the party has been set up, all of the chairs have bamboo backs.
When Laura's son is sitting at the table with his breakfast in front of him, his glass is empty in one shot and then full of orange juice in the next.
During the bird burial, Virginia Woolf places all of the yellow roses on the bird's grave except one. The next time we see her she has 3 roses.
In Clarissa's first visit to Richard's apartment, she gathers up some garbage and then drops the bags on the floor. Later when she opens the apartment door to leave, the garbage bags are already outside the apartment in the hall.
In the Virginia Woolf segment, Leonard Woolf is shown setting type for their press, Hogarth Press. In fact, Leonard's hands shook so that he could not set type, and it was Virginia who did the typesetting. Virginia found setting type calming, and said that it shaped her feel for words on the page, influencing her approach to writing.
When Leonard Woolf and Virginia Woolf are at the train station, an electronic display can briefly be seen hanging from the roof above Leonard's head.
When Laura (in 1951) picks up Mrs. Dalloway from the floor next to her bed, there are six novels in total. Two of the other books are Melbourne by Lord David Cecil and Under the Net by Dame Iris Murdoch, both published in 1954.