In the ribbon-cutting scene when Willy Wonka cuts the ribbon he turns around then his sleeve is covering his hand so all you can see are the scissor blades poking out. This is a reference to a previous Burton/Depp collabaration, "Edward Scissorhands." See more...
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Visible crew/equipment: In the Television Room, when Wonka is explaining how you will be home watching television, and a commercial pops up, and it wants you to try a Wonka bar (by reaching into the TV and getting it), you can see a cameraman standing behind the camera reflected in Wonka's glasses. It might be a little hard to see (try zooming in), but it's there.