While Will is at Mr. Yoshi's (Pat Morita) dojo, and mocking the crane technique, in the background on the hallway floor, you can see Mr. Yoshi's shadow while he's just standing there waiting for his entrance.
Ken Griffey Jr meets Will at a carnival and teases him about having a woman fight his battles for him. Will and Ken have only met moments before - he couldn't possibly have known about the fight at the bowling alley.