I've seen some of those splices, fortunately not during the show. One was at a check screening of a print for the Australian premiere of "The Piano" and it was my humble duty to make sure everything was ship shape. I was less than amused to see the leading lady jump several metres across the set because the projectionist had "fixed" some damage in the print by ripping several feet out and resplicing.
It took some hours and God's blessing to find an undamaged print in Australia in the couple of hours before the show. I would have preferred a total digital breakdown rather than some cackhanded dopey projectionist "helping" us out. Furthermore the director, Jane Campion, would be likely to have my intestines for garters had this proceeded.
Too bad they didn't see fit to send a brand new print for the Australian premiere, especially with the director present.

