Will & Grace (1998) - 88 mistakes in series 1

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 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.

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 Rob & Ellen are confronting Grace about how competitive she is, there are several shots of them from the same angle. In some shots there is a red bag visible in the bottom left corner, in others it disappears.

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

Visible crew/equipment: When Jack is explaining to Will how to visualize someone else while kissing them, you can briefly see a blue mat in the bottom right corner of the screen. This is where Karen later faints

Continuity: When Grace finally decides to move into Will's apartment near the end, we see Will eating a tub of ice cream. Between shots the ice cream tub lid jumps from being on the table behind Will, to suddenly sitting right in front of him.

Continuity: When Grace gets out all the videos which hint Will’s ‘secret’, she puts the bag on the table, but in the next shot it’s in her hand. Between these same shots a sticker also appears on one of the video cases.

Visible crew/equipment: When Grace is trying to persuade Will to come out to the cinema with her, the boom mic is visible at the top of the shot.

Revealing: When Grace slams into the side of the elevator buttons, they all light up except 4 (which is supposed to happen), but 5 lights up after she moves away from the panel.

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: When Will grabs the silly string from the table, he pulls off the yellow lid and drops it to the floor. In the next shot the lid is on the coffee table. It alternates from on the table/floor for a few following shots as well.

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: When Will is cleaning the tray, and in all following shots, from when he leaves the room, to when Karen walks over to Grace, to tell her to go get Campbell, there is a wine bottle which keeps jumping from the edge of the blue sink counter, to the edge of the counter which has the cooking gas-hobs on it.

Continuity: When Will and Grace sit on the rocks in the meditation room, at the end of the episode, the position of Grace’s coat changes between each shot.

Continuity: When Will and Grace play the “love her, hate him” game, they open a magazine up. In the next shot you can tell it’s on a different page, because the layouts have changed.

Visible crew/equipment: In most of Season One at least (choosing a specific moment here), Will and Grace have a large ornamental silver ball in their living room, which always reflects the studio lights and the fact that there is no fourth wall to the apartment.

Continuity: When Karen is lying on the table, her jacket is unbuttoned. And when Jack pushes her off the table and she gets back up, it's still unbuttoned. But as the shot cuts to her heading quickly over to the door, her jacket is now buttoned, but there was no time for her to do it.

Continuity: When Grace is showing Will how small her bathroom is, she has a towel around her neck, which has a spot of shaving cream on it, yet in a closeup of her telling Will to open the cabinet door, the cream has vanished, then reappears again.

Visible crew/equipment: The shadow of the boom is cast on Will when he says "Let's play the Pyramid!"