@Benton12 said:

An actor made to look like a dog faced Tellerite sitting in front of a curtain. Plus, the actor in 'Return to Tomorrow' made to look like a robot lying on a table. The latter is in the Star Trek blooper reel.

They used a lot of stuff in closing credits that weren't actually in the show. In those days of film, they very likely couldn't use the exact same film in the episode AND in the closing credits perhaps for MULTIPLE episodes.

Huh?