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The One Where Paul's The Man - S6-E22

Visible crew/equipment: In the scene where Rachel is trying to hide Ross from Paul, when he's about to go into Paul's bedroom after he says "Did you really hear a bear?", look at the window behind Rachel when the shot is on her. You can see a large light reflected in the glass and it moves slightly (not just in conjunction with the camera, it moves before the camera shifts).

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Visible crew/equipment: When Bruce and God are walking on water and God is explaining the rules of his powers, look at Morgan Freeman's hair, there is an extremely noticeable green tint to it which indicates that it was shot on a green screen.

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Jungle - S1-E6

Continuity mistake: When Naboo drops the necklace on the floor, in the wide shot when he turns around and disappears, the necklace disappears from the floor too, but then a few seconds later, Vince sees it and picks it up.

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The One Where Ross And Rachel Take A Break - S3-E15

Revealing mistake: In the scene where Ross brings the picnic basket to Rachel's office, he lights a candle and puts it near a plant (which then sets it on fire). However, the candle is barely (if at all) close enough to set it alight, and when it does, a huge flame just erupts from the middle of the plant, not the edge where the candle was.

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The One With Joey's Fridge - S6-E19

Visible crew/equipment: In the scene where Rachel introduces Sebatian to Chandler, Monica and Phoebe, there is a visible boom mic at the top of the screen in the wide shot, right after Chandler says, "Turns out he is kinda funny".

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The One With The Ballroom Dancing - S4-E4

Visible crew/equipment: When Phoebe and Rick are sat on the massage table, keep an eye behind Phoebe's head when the camera is on her, particularly after Rick says, "I can always find another masseuse." You can see the shadow of the boom mic moving.

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Stupidity: In the scene where Billy, Stu and Sidney are in the kitchen (when Sidney finds out they are the real killers), they begin to stab each other as a part of the plan to fool the police into thinking they were almost killed by Sidney's father, whom they were going to frame for the murders. They were planning on killing Sidney and her father, so it makes absolutely no sense that they begin stabbing each other BEFORE killing Sidney and her father, especially since Sidney would be at more of an advantage of outrunning them should she have the opportunity to since they have both been stabbed multiple times.

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Visible crew/equipment: When Harry and Dudley get attacked by the Dementors near the start of the movie, when Harry runs over to Dudley after he casts a spell on the Dementor, you can see the microphone wire underneath Dudley's shirt whilst he is lying on the floor.

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The Bat Jar Conjecture - S1-E13

Trivia: When Leonard, Howard and Raj are contemplating who to have as the fourth member of their Physics Bowl team, Raj says, "You know who's apparently very smart is the girl who played TV's 'Blossom'. She got a Ph.d in Neuroscience or something." The girl he's referring to is actress Mayim Bialik, who plays Amy Farrah Fowler in later episodes of The Big Bang Theory. Interestingly, she is the only recurring cast member on the show that actually does have a Ph.d in real life.

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The One With The Red Sweater - S8-E2

Audio problem: When Joey is proposing to Rachel and he tells Phoebe to give him the ring back, she says "No!" and pulls her hand away. When she pulls it away, she hits her chest and there's a thump sound that's clearly the sound of her clip on microphone being hit (it's way too audible to be just a thump on her chest). (00:17:50)

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