Visible crew/equipment: At dinner, just after Harry takes the plate from Petunia and as Aunt Marge says, "A bit more," referring to the brandy Vernon pours, in the left glass door of the hutch behind Vernon, there is a nice clear reflection of a crew member lowering his white sleeved arm off screen.
Visible crew/equipment: When Hermione and Harry go back in time, they duck and hide from Malfoy (after being punched) and his friends as they leave. The rectangular outline of a power pack (battery pack for hidden cordless mic) is visible at her lower back, under her pink jacket. It is visible in a few shots, including when they are at the pumpkin patch. The outline of Harry's power pack at his back is visible as well, as he bows to Buckbeak at the pumpkin patch, when they rescue him.
Visible crew/equipment: At the end of the film when Harry is in Lupin's office, Lupin packs his bags and then he walks past his desk. He then starts saying "If I am proud..." to Harry. As he says this, he walks forwards towards Harry, passing a cabinet of skulls. Reflected ahead of him in the glass panel of the cabinet is a very large boom mic which slowly moves out of sight as Lupin walks forward. It is very visible.
Visible crew/equipment: When Harry and Hermione are at Hagrid's to rescue Buckbeak, Harry walks toward the hippogriff and bows. In the next shot just as Beaky bows, when his head is down low, look directly in between the right edge of the screen and the wood post, above the pumpkins. A pair of black pants quickly pass to the left; it's certainly not one of the crows, unless it grew human legs. (Only visible in widescreen.)
Visible crew/equipment: At the end of the film, when Harry enters Lupin's office, he walks past a cabinet full of skulls, saying "You've been sacked?" Reflected in the glass panel of the cabinet is a cameraman with equipment, moving along with the camera, a little above Harry. He's a little hard to see, but he's there!