When Kelly catches Bo cheating in class, she walks up to the girl. Then there is a brief wide angle of Bo with Kelly nowhere to be seen, followed by a close-up of Bo with Kelly standing right next to her.
Mr. Blackmoor tells Kelly and Sabrina about Patty's missing ring. When Kris finds it, she hears Blackmoor's voice repeating the line, even though she wasn't there when he said it the first time.