35. The different colored stunt cat
But human actors weren’t the only ones given stand-ins during the filming of Star Trek: The Original Series. You see, Gary Seven’s beloved cat, Isis, was also given her very own lookalike to ensure that she didn’t get injured during the more action-packed scenes. There was just one problem, though: the replacement cat in question had different colored paws to those of Isis – something that could clearly be seen in several episodes.
34. The visible X marks
Robert Walker Jr. and DeForest Kelley were certainly professional when it came to hitting their actor marks. And we know this because the marks themselves are easily spotted on screen in the original series episode “Charlie X.” This particular blunder can be seen at the time when McCoy and Charlie are discussing language and speech.