Continuity mistake: In an episode fairly late in the life of the show, Lou Grant says that when Mary came to interview for a job at the station, she bumped into the desk in his office and said, "Excuse me" to the inanimate object. However, we saw that interview in the very first episode, and no such thing happened.
Continuity mistake: In the first episode, Mary gets the job as associate producer. Later in the series, Lou tells Mary that she got the job due to the awkward way she tried to cover a run in her nylon. At the job interview, Mary isn't even wearing pantyhose, she is wearing knee socks. You do not see her trying to cover up a run in her socks.
Continuity mistake: This episode and scene has been referenced already but contains another error. In the scene where Lou is recalling the first time he met Mary, he claims Mary had asked for a job as an assistant producer when in fact he gave her the job because it paid less than the secretary job she wanted.
Continuity mistake: Mary and Rhoda are sitting at Mary's having dinner. Rhoda is eating a plate of food with a fork in her hand and has a glass of water in front of her. As Rhoda is talking, the camera pans quickly to Mary, then right back to Rhoda, and in mid-sentence, she now only has a cup of coffee in her hand. The plate is gone, the water glass is gone, completely cleared from the table with no break in the conversation. (02:00:32)
Continuity mistake: Mary and Rhoda are sitting at the table having dinner in Mary's apartment. Rhoda has her plate and a water glass in front of her. The camera pans to Mary, but when it pans back to Rhoda (in mid-sentence), she is already drinking a cup of coffee and her plate is gone. There is no lapse in the conversation.
