Continuity mistake: When Alan is on the balcony talking to Evelyn, a shot is shown from inside the house. Alan turns away from Charlie and puts his left hand on his hip. The shot changes and Alan's left hand is now in the air and then he puts it on his hip again.
Continuity mistake: After Berta tells Charlie he owes her $74 for groceries, she walks to the table and says 'funny story' with Charlie facing the coffee machine with his head facing towards it. When the camera cuts to another angle, Charlies head is all of a sudden in a different position with no time to have made the move. (00:01:50)
Continuity mistake: While Alan's sitting on the couch, Evelyn's talking to Alan "helping...through a very difficult time," and in the shots facing Alan all of the books on the table behind him, and also the books on the couch's side table keep changing - not just their position, all the books actually become different books. Additionally, in the shots facing Charlie, the books beside the chair and the books/CDs/DVDs on the bookcase change as well.
Continuity mistake: While Evelyn is at Charlie's asking Alan if he's considered that there may be another man at Judith's "shacking up with her," Evelyn is wearing a blue 2-piece skirt suit, but in Charlie's close-up Evelyn's wearing a white suit with a red floral pattern when she's standing in front of Charlie, at the left side of the screen. (In the original pilot Evelyn is played by Blythe Danner wearing the floral suit, but she had to back out and was replaced by Holland Taylor, who's wearing the blue suit).