Ok so today I spent time working on the camera track as well as getting the HDR assembled image to be orientated properly.
It's not a perfect match, but I think close enough for reflection mapping and probably ibl. I'm thinking the mismatch is due to me shooting the sphere so close - I'd bet if it was shot at least 3-4 meters away - a physical impossibility - unless I broke down a wall - the results would be better. But oh well.
There is also a green tint in the CG render - I'm not sure why, but my wolfy intuition tells me it's most likely due to the florescent lights in the passageway. A little color correction will clear that up. Hopefully ;-)
Tomorrow, I hopefully will have time to create a matte object for the cup, as well as a model for the milk bottle. And texture it.
Given that I'm working in Houdini Apprentice, I'm set to render the maximum allowed - which is pal, at 768x576. The backplate is scaled down to a width of 768, and black bars put in to fill the empty space.