Are there other 'happy endings' and 'forget the deaths' episodes?
In 'the Children Shall Lead' they beam two guys into space and don't even go back for their bodies or mention them at the end.
"The Apple" is probably the prime offender. Umpteen redshirts are killed brutally, but at the end Kirk is joking about the birds and the bees and teasing Spock about looking like Satan . . . .