Revealing mistake: When Grapefruit cannonballs into the pull, it splashes on Pear. But no sign of any wetness is seen at all on him or the diving board.
Continuity mistake: To beat the traffic, Coop skateboards inside a construction pipe. The pipe is on the back of a truck, so it's not exactly very long, and gets picked up by a crane arm mounted on the truckbed itself. However, Coop takes ages to come out of the pipe, and in the shot from inside the pipe it looks as if is dozens of meters above the street level, which isn't. (00:08:00)
The White Mountains: November, 2089 AD - S1-E13
Plot hole: The main characters are being pursued by Tripods, mind controlling alien machines. My question is, if the Tripods can turn humans into 1600's puppets, complete with foxhunts, why don't they make some of said mind-controlled humans help with the pursuit?
Visible crew/equipment: After Raines shares details with Kellett about Semien's crew, when it cuts to Semien waking everyone up, just as he announces his contact with Belgian Federal Police, there's a visible T-mark taped to the floor behind Andre's cot. (00:24:25)
Reseda Rose - S1-E6
Revealing mistake: During the meeting on the beach, while Bill remains on the hill Ralph flies to the surfaced submarine, and in Ralph's closeups on the sub the crinkled black set wall behind him is painfully obvious.
Episode #1.1 - S1-E1
Factual error: There is a view of the night sky in southern Africa. However, both the Big and Little Dippers (along with Polaris) are visible. In general, these constellations are not visible in the southern hemisphere, and where they are (North of 1° South latitude) they are very close to the horizon. The Big Dipper (Ursa Major) is to the left of the screen and Polaris (part of the Little Dipper = Ursa Minor) in near the top-center. This occurs shortly after the lion cub scene. (00:44:00)
Audio problem: After Kate shoots an arrow at the mafia guys, she says "told ya." Then we hear Clint/Hawkeye say "yeah", except he's on camera and his mouth doesn't move, he doesn't even change his facial expression.
Factual error: In the last minutes, the show looks forward to future challenges, in effect a preview of the never-made 3rd series. The oracle says they must find "the golden fleece, woven long ago by the Stygian witches." But the golden fleece, or indeed any fleece, is not a woven fabric. (Today's fleece is a modern invention).
Continuity mistake: As Jizzlord says, "so really, this is a good thing", he's holding the posters upright, facing Jen. Cut to a shot from the side and he's holding them horizontally, facing upwards.
Other mistake: Callisto's sword is missing. She's the Warrior Queen, so she should have her sword. When Callisto appears in the Xena Season Two episode "A Necessary Evil", her sword has reappeared when Xena frees her from the Labyrinth of the Gods for her help with defeating Velasca.
Life Lessons - S1-E4
Visible crew/equipment: When Yale is still trying to access the "E2" files, Alonzo asks if he is OK. A few shots later the camera zooms in on Yale's eye, and you can see the camera reflected in his eye. (00:39:35)
Plot hole: Tori somehow knows who Marah and Kapri are, despite never meeting them before.
Beyond the Farthest Star - S1-E1
Continuity mistake: There is an alien in a Starfleet gold shirt sitting next to Sulu. For a second, there is a human in a Starfleet red shirt, then it goes back to the gold shirt alien.
Continuity mistake: When Galen, Burke, and Virdon enter the village, Gregor's hands are far apart grasping the bars of the prison cart as they pass. Quick cut back to Gregor and his hands are closer together, holding bars that are next to each other.
Other mistake: After they arrive in Marina Bay the pink ranger is wearing the red ranger's jacket.
Episode #2.4 - S2-E4
Continuity mistake: When Jacqueline raises a hand in response to her name being called, she puts up her left hand. A shot later, she has her right hand up instead.
Continuity mistake: When Marshall first finds Trip's letter, he holds it from the left side. In the close-up, he's holding it from the right side. (00:02:10)
Flash Gordon and the Planet of Death - S1-E1
Revealing mistake: In the flashback of the scientists' fate on the planet of Death, the sole survivor manages to run away and avoid the ray of "Belfagore" (which is just a big flashlight). Problem is, he does not; before hitting Bending behind him, the beam fully lit up his back, but he suffers no adverse consequences, no dropping dead for Jefvus. (00:06:40)
Continuity mistake: When Will tackles Andrew, his shirt is lifted up exposing a blue undershirt that's tucked in, which is also behind his gun. There's two shots of this, but in the next shot, right before Will punches Andrew, we don't see the undershirt.