Plot hole: In the episode "Lows in The Mid-Eighties" during the flashback scenes, it is shown to us that Will comes out of the closet during his freshmen year of college during Thanksgiving Break, when they spend the weekend at Grace's Parents house. However in the episode "Willian, tell" Grace claims that Will came out to her at senior year of college during Christmas Break. Quite a difference for such a memorable time.

Continuity: When Karen is talking with Norman about donating funds for his advert, and then when Jack enters, between shots during the scene Karen's pearl necklace keeps jumping in and out of her black shirt.

Plot hole: Ellen and Rob wear wedding rings, yet their wedding is not announced until "An Affair to Forget" in the second season.

Continuity: When the guys are playing poker, the chips and cards on the table move about.

Continuity: When Jack holds his glass of water, he changes from holding the stem of the glass, to the actual bulbous part of the glass between shots.

Continuity: When Karen is sorting out her clothes at her work desk, the black sweater hanging over the desk lamp disappears then reappears.

Continuity: When Grace is reading through her diaries, through all following shots in the scene the position / location of the yellow, furry diary on the floor keeps changing.

Revealing: Grace's boyfriend has six toes but in closeup shots, when he takes off both socks you can clearly see only five toes on each foot, when they are specifically trying to hide one foot.

Continuity: When James Earl Jones puts his hat down on the piano, he puts it upside down. But in a later shot, as he tells Jack that he's fired, we can see the hat is now the right way up, behind Karen. Later it's upside down again.

Continuity: After Will and Grace make Larry drop the birthday cake, there is a black woman standing behind then, an a green shirt. As Will and Grace then start to shout at each other, the woman walks away three times between shots.

Continuity: When Grace is showing Will her ideas for the bathroom, whenever she shows Will pages in her magazines, the pages they’re on change between shots, and the magazines on the table differ from opened/closed.

Continuity: At the end of the episode, "Buzzy Wuzzy" takes her bee mask with her and they leave. But when Will and Grace dive for the jawbreaker, the bee mask is back on the coffee table.

Continuity: Following the argument between Will and Grace when she returns from City Hall, Karen tells Grace she "thinks it's time for a couple of blue bibbies." Watch closely as she removes the lid from the pill bottle, takes out some pills, and puts the lid back on. The scene shoots to Grace and we hear Karen shaking the closed bottle. When the scene shoots back to Karen we see that the pill bottle is open again and Karen closes it yet again.

Continuity: When Grace is telling Will about his dad's affair, she mentions that he grabbed the other woman's ass when she brought him a packet of Goobers during the interval. The thing is, she sees them for the first time during the interval, and we see the conversation that follows. The mistress brings him wine, not Goobers, and he doesn't grab her ass.

Continuity: In the opening scenes, Grace has red nail polish on. Later in the same scene, it has vanished as she shakes Mrs. McFarland's hand.

Continuity: When Jack and Karen are waiting outside the INS office,Karen's leans against the back of the bench she is sitting on, and her arms are not crossed. When the shot changes, her arms are suddenly crossed.

Continuity: When Will tells Grace he's gay, the champagne bottle on the table keeps rotating.

Continuity: When Ellen says to Grace "Okay, what do you mean Will and You have never done it?" the red plastic cup she holds swaps hand three times between shots.

Continuity: When Jack is telling Will and Karen what he was doing at the hospital, as he says "a little over the smock fondling..." Will begins to drink his wine, yet in the next shot, we can see in the mirror that he isn't.

Continuity: When Dr. Hershberg begins to cry about the bad news he delivered in the other room, he goes over to cry by the small table with items on it. During this part, the grey box sitting on the table keep opening, closing, moving etc.