The Daleks - S1-E2
Visible crew/equipment: About 90 seconds into Episode Two, the shadow of the boom mic equipment moves across the wall, and crosses Ian's face and shoulder. (00:01:29)
The Daleks - S1-E2
Visible crew/equipment: The boom mic shadow makes an apperance in Episode Two, moving across the console as the Doctor suggests abandoning Barbara.
100,000 BC - S1-E1
Visible crew/equipment: The boom mic makes an quick appearance about 18 minutes into episode one. It is in the upper left corner when the camera switches from a close up of the Doctor and Susan to a medium shot of all four characters.
Visible crew/equipment: In episode one, when the Doctor is near the pyramid, Ian's leg can be seen just before the shot ends, as the consecutive shots used the same section of wall.
The Daleks - S1-E2
Visible crew/equipment: Toward the end of episode one, when Ian is wondering where Barbara is, the shadow of a boom mic moves over the door behind him.
Visible crew/equipment: In episode one, when Ian is first seen inside the pyramid, someone stumbles through the background. Some have claimed this is Barbara, but it happens too fast to tell.
Visible crew/equipment: Part 4, A Race Against Death: The Doctor chides the First Elder about Ian's illness and says, "I must have chemicals and equipment; his death will be your fault and yours alone." Then, just as the Second Elder appears and says, "Sir," the boom mic (with white end) swings up between the two Sensorites, and we also see the diagonal boom pole moving at the left side of the screen.
Visible crew/equipment: In episode one, when a Voord falls through a pyramid door, a stage hand can be briefly seen on the other side.
Visible crew/equipment: When Susan runs out into the console room in a panic, the shadows of two crew can be seen on the wall.
Visible crew/equipment: Part 5, Kidnap: In the Sensorite lab, the Scientist shows the Doctor and Ian a collection of things left behind by the humans, who were killed in the spaceship explosion. When Ian flips through the family snapshots, the shadow of the boom mic passes over Ian's forehead. It happens again just as Susan blurts, "The City Administrator, of course!"
Visible crew/equipment: Part 4, A Race Against Death: While Susan is with Ian and the First Elder, Ian tells her, "The Doctor must have run into a snag..." When Susan replies that she's going to find out why, just as she stands up a boom mic becomes visible at the top right side of the screen, and it's pulled up out of view. Then, as the First Elder says, "I will have you conducted to the laboratory," the shadow of the boom mic is on his head.
Visible crew/equipment: Part 4, A Race Against Death: After the Doctor states he's going off on an expedition, John still struggles to warn the Doctor, and when the Doctor tells Carol, "Now you stay with him, I think he's getting better," a boom mic becomes visible at the top left side of the screen.
Visible crew/equipment: Part 3, Hidden Danger: When the First Elder tells the Doctor, Ian, and Susan about their refined aqueduct water beneath the city, Ian drinks some of it. Then just after the Doctor says, "Vintage water," the tip of the boom mic sweeps across the top of the screen.
100,000 BC - S1-E1
Visible crew/equipment: The studio ceiling and lights are visible at several times during the console room scene.
Visible crew/equipment: When the Doctor and Ian enter the house in episode one, there is a shadow of the camera on the wall next to Ian.
Answer: It was never destroyed on-screen; it was intact at the end of the TV movie, and destroyed by the start of the 2005 series. It was destroyed in the novel "The Ancestor Cell," but in a completely different manner to what happened in the series.
DaveJB