After Susan lets the creature grope her breasts, she stabs it in the shoulder. It can be briefly seen, the creature snatched her bra off afterwards. Briefly after that, Susan's breasts are clearly visibly and bouncing about during a chase scene. However later in the film, her bra can been under her shirt. There is no indication in the film Susan went back to retrieve her bra.
Giorgio, the freak, could not remove his metal arm restraint without ripping his thumb off first, as the restraint was too small. But near the end of the film John easily put this restraint on his own arm, and earlier Giorgio put the same restraint over both arms of the prostitute.
After the family gets to the castle, the castle freak rips off his left thumb to escape the handcuffs. In the end where he is kissing the daughter, he clearly has two thumbs.
When the Duchess is taking bread and dried sausage to The Freak in the opening sequence the sliced bread has a gaping hole in it in the kitchen but is whole by the time it makes it to the dungeon.
Giorgio breaks the mirror, but it's broken differently in the next shot when the family arrives.
When Giorgio jumps through the window in front of Susan and Rebecca, he would break his legs jumping from that kind of height.