Factual error: In a number of episodes people are shown eating and drinking in the laboratories. For instance, in "Miss Willows' Regrets" Nick and Greg are seen eating fried chicken in the lab, and in "Overload" Sara eats a sandwich while watching Grissom experiment with her deli pickle. There are other examples. No reputable laboratory (which this is supposed to be) would allow its staff to eat or drink while in the lab. It is basic scientific protocol to prevent contamination of samples or the person picking up toxins on their food.
Star-Crossed Lovers and Other Strangers - S1-E16
Visible crew/equipment: When Rory asks Lorelai to call Emily to get her out of Friday night dinner so she can celebrate her and Dean's 3-month anniversary, a boom mic drops into the shot as Lorelai stands to get the phone. (00:07:05)
Episode 119 - S1-E19
Continuity mistake: Ted asks whether anyone wants to see the new Matt Damon film and then takes the fork to his mouth. Right then the angle changes and the fork is suddenly down and he is repeating the movement.
Mainstream - S3-E3
Continuity mistake: When Kitty goes to get a midnight snack, her hair is down. But a few shots later, her hair is up in a ponytail.
Do No Harm - S1-E7
Continuity mistake: The Councilwoman who is waiting for Dana Stowe is talking on her phone in the waiting room, but she is holding the cell phone upside down.
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.
End Game (1) - S8-E7
Revealing mistake: Boyd has a video-conversation with Linda on the phone she sent him. On top of the screen you can see how long the video will last (1 minute and 3 seconds), showing it's a pre-recorded video, not an actual live conversation.
Character mistake: During his interrogation, Ken comments that he beat Christopher's impulsive violence out of him. But in "The Perfect Thanksgiving", he tells Erin's brother Michael that he never hit his children, choosing instead to destroy their self-esteem.
Factual error: When Jo-Jo tells Dexter that his father was shot down in Vietnam, he points to a picture of Dad. However, the pilot in the photo is standing between the engines of a twin-tailed fighter. Neither the Air Force, nor the Navy was employing such an aircraft over Vietnam in the late 60's or early 70's.
...And Four Stolen Hooves - S1-E1
Visible crew/equipment: When the jockey falls from the horse, there is a 2nd quick shot of the same scene, to extend it a few seconds. In the first part, the horse is running free; in the 2nd, we can see the bridle that's leading the horse forward. (00:36:20)
Episode #1.2 - S1-E2
Other mistake: The very first word of the opening title contains an embarrassing typo, considering it's the name of the main character: It reads "Maud'Dib", instead of "Muad'Dib".
Character mistake: There is a spelling error in the newspaper that Sakurako Sawatari is reading in one episode: the word, "admits" is spelled "adwits." (00:01:00)
Other mistake: After they arrive in Marina Bay the pink ranger is wearing the red ranger's jacket.