Star Trek: The Next Generation (1987) - 11 major mistakes

Visible crew/equipment: In the episode "Reunification part 2" when Picard, Spock, and Data have just escaped from the female Romulan commander, when they are walking out of the room look at the green glass ornament - you can see reflection of a crew member.

Continuity: When Picard asks the Ferengi if they are withdrawing their surrender, Yar's arms pop back and forth from folded to extended as the shots change.

Continuity: After drinking some spiked Champagne from Lore, Data falls backward, yet lands on his face.

Visible crew/equipment: In the episode "where no-one has gone before" from series 1, near the start, just as Riker says "you have all the time you need", the engine consultant stops and turns around. As he does so, look above his head and you can see a microphone hanging down. The camera quickly adjusts so it's not visible any more.

Continuity: In the beginning of this episode, Riker orders Geordi(who was navigator at the time) to increase to Warp 6. In response, Geordi replies, "Aye sir, Full Impulse."

Continuity: In the episode 'Yesterday's Enterprise' (season three, episode 15), watch the final scene with Geordi and Guinan in Ten-Forward. Although time and the universe has returned to normal, Geordi is still wearing the uniform from the alternate timeline (note the sleeve detail, and the extended neck piece).

Visible crew/equipment: When Riker tells Yar to open a channel to the Jarada, you can see the reflection of a boom mike in the workstation along the back wall behind him.

Continuity: In this episode, when Riker makes his log entry, he says the stardate is "4124.5," the 4-digit style of stardates from The Original Series, rather than the 5 digit style used in The Next Generation.

Revealing: In the scene where Barcley reappears on the transporter with the crewmember, they both fall to the ground. The transporter chief had put up a forcefield around the transporter chamber, in case something goes wrong. However, when the crewmember falls to the ground, his foot goes right through where the forcefield is meant to be. It is still active, as only a few seconds later we see it being deactivated.

Plot hole: Data calculates the time to reach the Neutral Zone in time by assuming maximum warp speed. After the solution, in the last minutes, Picard orders only warp six. With this speed, they won't get there in time. Aren't they in a hurry anymore ?

Revealing: In season 5, "The Game," the brainwashed crew members hold Wesley's eyes open to force him to see the mind-controlling game. Their intention is to prevent him from closing his eyes, which would protect him from the device. While they are doing this, he blinks.