The 22-year-old actor recently admitted to Heat Magazine that he would sometimes come to the 'Potter' set drunk.
Well that explains a few scenes.
Radcliffe had been struggling with alcohol addiction while working on the last Potter films, and says that he would stumble into work drunk, but never drank on set.
Radcliffe has apprently given up drinking, and was on good behavior while filming the recently released "The Woman in Black."









