The IMDb "Goofs" page for Eyes Wide Shut has a long list of flubs and continuity errors beyond that one camera reflection. Even if he'd lived to fine-tune the edit further, Kubrick could not have fixed all of these in post. Many of them would have required reshoots, and we already know how notorious this production was for its protracted shooting schedule. In fact, it was probably Kubrick's insistence on doing endless takes and reshoots to get the performances exactly how he wanted them that caused most of these continuity problems in the first place.
Eyes Wide Shut (1999) - Goofs - IMDb
Eyes Wide Shut (1999) - Goofs on IMDb - bloopers, mistakes, errors in continuity, plot holes, anachronisms, spoilers and more.
www.imdb.com