Timeline?
When "Happy Days" first aired, it was disctintly set in the 1950s. Now, I'm strictly going by memory here, but I seem to recall that, by the last season (which would've taken place in the 1960s), the clothing and hairstyles of the characters slowly crept towards the contemporary (for instance, Joanie's perm). And when "Joanie Loves Chachi" aired, it seemed to take place in the present day. In fact, that cheesy music they made was certainly NOT reminiscent of what was being played in the 1960s.
Has anyone else noticed this? Was this ever explained and/or listed as a continuity "goof?"