Continuity: In Series 1 Episode 14 "Joey and The Premiere", Joey is speaking to Lauren. In between shots when we see Lauren, the items on her desk change position.

Visible crew/equipment: In episode 2-17 (Joey and The Big Move), when Joey is leaving his old house, you can see a part of boom mike at the top of the screen (over the doors).

Other: In season one when Alex got divorced, Joey and Gina talked about how Gina got divorced from Michael's father while she was still in high school. In season two, we learn that Jimmy is Michael's father. Joey didn't even know that they were together, he certainly would have known if they were married.

Continuity: In Series 1 Episode 14 "Joey and The Premiere", Joey is talking to Brody. He has a cup in his left hand, then when the shot changes, it's in his right.

Continuity: In episode 2-4: "Joey and the Stuntman," Joey visits Abby at her house. When she first sits down, her arms are open and her low-cut blue blouse can be seen beneath her green jacket. There is a shot of Joey from behind her, during which her right arm is on her leg. Immediately after that, the shot switches to the front, and her arms are crossed across her chest and the green jacked is pulled tight up to her neck.

Continuity: Joey states he has never lived alone. Yet in "Friends," he had his own appartment.

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.