Purpose Display two strings; the first on one line, the second one line below.
Code
	ld hl,(256*5)+10	;row 5, col 10
	ld (_penCol),hl
	ld hl,stupid_string	;string to display
	call _vputs		;display it
	ld hl,(256*(5+7))+10	;row 12, col 10
				;each line is
				; 7 pixels
	ld (_penCol),hl
	ld hl,stupid_string
	jp _vputs		;display it & return
	
Error It was good that we used hl to load up our coordinates, but there is some redundancy in that we do ld hl,stpuid_string, call jp _vputs, and ld (_penCol),hl twice. We could make a universal call that would load the coordinates, load the string, and display the string. One of the keys to optimization is looking for redundancies. The second routine saves 4 bytes in the end.
Fixed Code
	ld hl,256*5+10		;1st coords
	call display		;put first string
	ld hl,(256*(5+7))+10	;second coords
display:
	ld (_penCol),hl		;load what's in hl
				; as coordinates
	ld hl,stupid_string	;display same string
				; both times
	jp _vputs		;display it and
				; return from our
				; call the 1st time
				; and from our
				; routien the 2nd