Audio problem: Outside the Miller's house the detective who was interrogating Scott is now shouting at the house with a bullhorn. When the detective lowers the bullhorn, his voice sounds like it is still being amplified.
Audio problem: When the cops stop the random Santa on the street thinking that he's Calvin, he says, "It's not even my suit! It's a rental!" But his lips are completely out of sync.
Audio problem: When the elf special forces are about to take off and the female elf does a somersault, the sound that is created when they touch their wrist console can be heard over the sounds of the jet pack take off sounds. No one is even touching their wrists during the scene. (01:19:27)
Answer: If he told people he was not deliberately trying to look like Santa Claus, that would cause them to be even more suspicious of Scott Calvin having a mental disorder, not a physical one. Remember, Scott went to see his family doctor, Pete, and Pete tried to explain to Scott his physical changes as a matter of changing his diet from milk and cookies, and Scott suffering from a hormone imbalance. Scott tried, but not even Doctor Pete, a professional in the medical field, could help him.
Scott215
This question is about his mental state. Not his physical transformation. In other words, he could say "There's nothing mentally wrong with me that would make me think for one second I am Santa." His physical transformation could be explained by people thinking he's overeating, growing facial hair and his hair turning white.
Except, Doctor Pete was incompetent. Nobody has the drastic physiological changes that Scott had, and Dr. Pete seems committed to blaming them on 'routine' aging and diet factors. In real life, a competent doctor would be submitting Scott to a continuous battery of tests, cancer screenings, CT scans, etc.