I did see the movie, and I'm watching part two of that trilogy now, and part three will be next because I DVR'd them off of El-Ray. Daniel Laruso saw him trying to do it in part one and asked him if he had ever done it before and was told no. He then asked if he could try and succeeded and Miyagi said it was beginner's luck in broken English even though he was probably more fluent in real life since he was born in Los Angeles. In addition to his days on Happy Days, it seems like I remember him having another TV series.
Take care and God bless