Plot hole: In the episode where Joey tells Jimmy that Michael is his son and they cut of some of his hair to do a DNA test, Gina tells Michael that he is missing some hair on the back of his head. In the next shot the angle changes, we can now see the back of Michael's head, and he's not missing any hair.
Joey (2004)
1 plot hole in show generally - chronological order
Starring: Jennifer Coolidge, Matt LeBlanc, Andrea Anders, Paulo Constanzo
Genres: Documentary, Short
Joey and the Premiere - S1-E14
Continuity mistake: Joey is talking to Brody. He has a cup in his left hand, then when the shot changes, it's in his right. (00:05:50)
Joey and the Dream Girl (2) - S1-E9
Michael: You're a hot girl. Hot girls get stuff for free.
Joey: Yeah, it's true. It's in the Constitution.
Alex: Look, I know what I am. I'm not a hot girl. I'm cute.
Michael: You're a hot girl that doesn't know she's hot. Joey was telling me about those.
Alex: No, I know hot girls. My sister is one of them.
Michael: "The even hotter sister" – one of four ways a girl doesn't realise she’s hot. Along with "went to a girls' school", "used to be fat", and "is blind."
Joey: You have learned well, young Michael.
Trivia: Joey's agent (Jennifer Coolidge) also played Amanda, Monica's full-of-herself friend with a fake British accent in series 10 of Friends.