Continuity mistake: In "The Owner's Suite series," when Tom Warner is talking to Gray Davis about which drink was his, and which belongs to Mr. Davis, Tom takes the straw out of the glass, blows in it, and lays it on the counter. In the next shot the straw is back in the glass.
Continuity mistake: In the college flashback episode, Greg and Kim go stay with her sister and Jimmy. While they are there, they meet Jimmy's friends. Yet, later in the series when one of them comes to LA to try to become an actor, Jimmy introduces him to Greg like they've never met before.
Continuity mistake: In "The Premiere Series," in the opening scene, when Jimmy and Christine are talking about how they'd like to go to the premiere, Christine has a magazine in front of her, which she has no interest in. Between shots, the magazine goes from displaying two red pages, to two brown pages, to two red pages, without Christine making any gesture toward the magazine.