Lucy Van Pelt's frequent outburst to Charlie Brown / THU 6-24-21 / Caro who directed 2020's... or how to fill some squares in this puzzle) — a rebus puzzle: you have to put "HEAD...
the puzzle calls SANTA'S LITTLE HELPERS (get it, 'cause they're helpers and they're little... is not such a thing (61A: End of autumn?). Nor is SILENT B ("thumb"). Or SILENT M ("mnemonic...