This episode features the return of the original, shorter title sequence, after fan backlash. This sequence remained the same, with the occasional, small variation until the final season's changes.
Before Dr. Mickhead was a regular on the show he was just an uncredited extra. In this episode you can clearly see Dr. Kelso shake the future Dr. Mickhead's hand and call him Dr. Carlson because he had not yet been named Dr. Mickhead or maybe before he was Dr. Mickhead he was known as Dr. Carlson.