Corrected entry: When Will and Grace go and see a movie you can hear the Titanic theme song, but when they get back Grace mentions that Will couldn't even sit through a ninety minute movie. Titanic is more then a ninety minute movie, in fact it is over twice that length. (00:32:25 - 00:37:40)
Corrected entry: When Jack goes back to Karen's place for the last time to tell her that he no longer wants to massage her, he says "I took an oath in front of God and my mother, I'm here, I'm Queer get used to it." But his mother doesn't know that he's gay until they mention it in "Homo for the Holidays" in Season 2. (00:19:15)
Corrected entry: At one point, Karen tells Jack that she had her mother committed, which doesn't make any sense because in the next season, in "Someplace Old, Something New", Suzanne Pleshette debuts as Karen's Mother, Lois Whitley, and we learn that Karen was estranged from Lois due to Lois' con artist ways.
Corrected entry: Season 5, Episode "Sex, Losers and Videotape." Grace is trying her darndest to make a sexy video to send to Leo - why? He's working on a viral outbreak in sub-saharan Africa, and he told Grace in an earlier episode "these people don't have running water." Doesn't make sense that his precious cargo of food and medicine would include a VCR, even if electricity is on hand.
Corrected entry: Season 5, Episode "Bacon and Eggs." After multiple rejections, Grace finally decides to call Leo. She pulls his business card out of her wallet, presumably to look up his number, but barely glances at the card as she dials. (This would be plausible if she memorized his number, but if so, why pull the card out?)
Corrected entry: Will's mum sends over a collar belonging to his old dog, Daisy, who he apparently thought he would have for the rest of his life, and he was really upset when she died (while he was at college). But in "The Truth About Will And Dogs" (Season 1) Grace is trying to persuade him that they should get a dog together, and Will states that he doesn't like dogs.
Corrected entry: At the end of the episode (6-3), Will's mother finds a video in his apartment whose title she describes as "Splendor in the Grass, with the G-R missing." The only problem is that "Splendor in the Ass" really is the title of a pornographic film, but it's a straight film - not a gay one like Will would own. (I looked it up on the Internet, I swear.)