Character mistake: The firefighters state that the acronym for CPR is ABC for Airway, Breathing, Circulation. This is very outdated as in 2010 the American Heart Association changed the recommendation to CAB for Compressions, Airway, Breathing following evidence that compressions first in CPR saves more lives.
Love and War and Love and War - S2-E10
Continuity mistake: Once Clay gets shot by his team and has to get out he swipes off his goggles but when they change shots he has them back on.
The Ex-Files - S1-E5
Continuity mistake: When Dharma is visiting her uncle (a dentist) and she's in the dentist chair, she has a little spot of water on her bib, the shot moves, then it moves again and the spot isn't there anymore.
Plot hole: Bonnie is the anchor for the other side and feels when supernatural beings die. How come she didn't know Katherine wasn't dead? Did she never think it was suspicious that she never felt Katherine's body after she died?
Suggested correction: Katherine died but didn't go to the other side. So she didn't need to go through Bonnie. She went to hell to Arcadius. Bonnie is not the anchor to hell, we don't know how going to hell works.
After everyone finally realises that Elena had been possessed by her Doppelgänger Predecessor, It is actually shown that Katherine were more or less dragged away from Bonnie before she could crossover to the Otherside. So we do have some idea as to how one ends up in Hell.
Suggested correction: Katherine was a human technically when she died.
Technically, she was supernatural because she was a doppelganger, so she should've gone through Bonnie.
And even she was a traveller.
Delenda Est - S3-E11
Revealing mistake: When Dylan and Tyr head to a bridge where supposedly the power source is located as well as Rommie, they start to cross the bridge. As the camera is facing Dylan and Tyr, the next scene two aliens teleport in. Rewind the video to facing Dylan and Tyr and play in slow motion. Watch the bottom portion of the screen and notice the top portion of one of the alien's head go into the camera as if the aliens walked into position for the teleportation.
Continuity mistake: When Sheila Carlisle has hanged the dead head up on the wall of Eugene's office, they are all looking at it and the eyes are looking straight in to the room. Later in the episode, the eyes are looking more to the right.
Old Scores - S2-E17
Continuity mistake: In the scene where Shaddock is shot in the arm you can see that the wound moves from near his elbow to his shoulder.
Continuity mistake: In Episode 5, "Live Hard, Die Young and Leave A Good Looking Corpse": As Lillie is preparing to cut Zane's throat with her fingernail, she stands with her hand raised above her head for a while. When seen from the front, her hand is balled into a fist with the index finger extended, but when seen from the back all her fingers are extended. The view alternates like this several times, and each time the hand varies between fist and outstretched fingers.
Water's Edge - S3-E3
Factual error: Pete Taylor's corpse is a bare skeleton after just two years in the sea-shack's attic, though it shouldn't be. There should at least be traces of hair and clothing surrounding the bones. (00:40:00)
Revealing mistake: When Rachel and Adam first meet, their cars crash in the car park. In the shot where they both get out of their cars, you can see a dry patch of ground under Rachel's car, but the rest of the area is wet. Why would that space be dry, if Rachel just crashed and it isn't raining heavily at the time?
Continuity mistake: While Josh and Cooper are fighting Gabi shouts, "You need to stop fighting.., because you're bad at it and it's embarrassing," then in the next shot the top shelf of the shelving unit is collapsed with nothing on it, but two shots later that shelf is fine with the books, plant, etc, all set up properly. (00:02:45)
Rallying to Keep the Game Alive - S1-E4
Audio problem: When the couple is having dinner there's a shot from behind him saying "but you're right." The movement of his jaw and mouth are totally out of sync.
Factual error: The battalion commander wears the correct crown and pip of a lieutenant-colonel, but the four cuff rings of a full colonel (lieutenant-colonels wore three).
Revealing mistake: When Matthew is sliding backwards because his shoes are icy, just before he falls you can see the board he was on to allow him to move backwards. (00:02:00)
Continuity mistake: Prior to the dinner at Fancy's with George's parents they show the restaurant from outside but the person in the window is the Veterinarian that Zoe stands up later this season and it is actually the same exact shot from when he is waiting for her to show up for their date.
Sex, Drugs and Rockin' the Cradle - S3-E14
Visible crew/equipment: The tip of a boom mic is swinging in the upper left of the screen during a late scene between Amanda and Peter. (00:32:13)
Continuity mistake: After the dance, when Jack is talking to The Big Three, he grabs the towel and puts it on the other side of Rebecca. When the scene cuts back to Jack rubbing Rebecca's belly, the towel is still on Jack. Then, when Rebecca's water breaks, it is back to being on the other side of her. (00:03:40 - 00:04:12)
Continuity mistake: Guy of Gisbourne says to Robin Hood that he should lay down his weapons. Robin Hood throws his bow and sword on to the ground. He then gets thrown down the cliff, into the river. A few minutes later, when we get focused on him again, we see that the bow is lying in the river with him. (00:06:05 - 00:10:55)
Continuity mistake: At the beginning, Kate's friend gives her ex-fiance's letter to Kate. The letter is held differently in consecutive shots.
Character mistake: The invitation for the wedding comes with a calendar for the month of April, with the date of the wedding circled. There are 31 days shown on the calendar, but there are only 30 days in April. (01:12:42)