crush tour dvd:
the biggest overdub is before the prayer's solo, when jon sings "Livin on a prayer".
and this is an unbelievable case: this "prayer" is overdub for 2 times: one for the dvd, the second one for the one wild night album. so, we have 3 different versions of this prayer.

i think the same fragment is also overdub on wembley 95 dvd

(this fragment was often directly overdub during Own and bounce tours show)

another case is after something to believe in solo, when jon sings "i don't believe in jesus": you can find a prove of that comparing own 85 01 album and yokohama 96 tv dvd

etc etc