Stephen Colbert kicked off his final week behind the “Late Show” desk with a trip down memory lane, unearthing graphics that never made the cut, including one that declared Hillary Clinton the winner of the 2016 presidential election.

After a recent parade of big names from Bruce Springsteen to Robert DeNiro and Barack Obama, Stephen Colbert said farewell to his audience in the final episode of the Late Show on Thursday night.

Colbert was hinting at one came next, because the following day, he made an appearance as the host on Only in Monroe, the Monroe, Michigan public-access show that he had first appeared on back in July...