I'm watching Pegasus now and at eight around 25 minutes in, there's an aft shot of the Enterprise in the asteroid field that appears to be CG. I don't recall this being mentioned previously.
Yup, it was originally stock footage from Booby Trap, which was replaced with the CGI model for TNG-HD. http://tng.trekcore.com/hd/albums/3x06/booby_trap_hd_305.jpg . That shot is seen again in Genesis too.
The CGI Enterprise is also seen replacing this shot:
http://tng.trekcore.com/gallery/albums/s7/7x12/thepegasus102.jpg