LittleWildman

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).

LittleWildman

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.

LittleWildman

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".

LittleWildman

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.

LittleWildman

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.

LittleWildman