When the show's 5th season ended,it was 1962. With this first show of Season 6,it's now 1964/1965 and nearly 2 and 1/2 years in the lives of the characters have been skipped over.
The final episode to take place in Milwaukee.
The footage of the girls leaving the brewery was unused footage shot at the same time as that used in the original opening credits. They are wearing the same outfits, albeit without scarfs and coats, and the time cards in the racks are identical with the same man at the gate.
Laverne claims that Shirley (and herself) are 27 years old. Cindy Williams was 33 that year and Penny Marshall 37.